Bright Zoom Maths

 Aptitude Solved Problems - Profit and Loss  1. A trader mixes 26 kg of rice at Rs. 20 per kg with 30 kg of rice of other variety at Rs. 36 per kg and sells the mixture at Rs. 30 per kg. Find his profit percent ?  Answer: 5 %  Explanation:  Cost Price of 26 kg of rice = ( 26 * 20 )  = Rs. 520  Cost Price of 30 kg of rice = ( 30 * 36 )  = Rs. 1080  Cost Price of 56 kg rice = Rs. ( 520 + 1080 )  = Rs. 1600  Selling Price of 56 kg rice = Rs. ( 56 * 30 )  = Rs. 1680  Gain = Selling Price - Cost Price  = 1680 - 1600  = 80  Gain % = ( Gain * 100 ) / Cost Price  = ( 80 * 100 ) / 1600  = ( 8000 / 1600 )  = ( 80 / 16 )  = 5 %  2. Vimal bought paper sheets for Rs. 7200 and spent Rs. 200 on transport. Paying Rs. 600, he had 330 boxes made, which he sold at Rs 28 each. Find his profit percentage ?  Answer: 15.5 %  Explanation  Total investments ( Cost Price ) = ( 7200 + 200 + 600 ...

Tricks to multiply a number by 39 Example: 1 26 * 39 Step 1: Multiply 26 by 4 26 * 4 = 104 Step 2: Multiply 104 by 10 104 * 10 = 1040 Step 3: Subtract 26 from 1040 1040 - 26 = 1014 26 * 39 = 1014  Example: 2 125 * 39 Step 1: Multiply 125 by 4 125 * 4 = 500 Step 2: Multiply 500 by 10 500 * 10 = 5000 Step 3: Subtract 5000 from 125 5000 - 125 = 4875 125 * 39 = 4875 Example: 3 342 * 39 Step 1: Multiply 342 by 4 342 * 4 = 1368 Step 2: Multiply 1368 by 10 1368 * 10 = 13680 Step 3: Subtract 342 from 13680 13680 - 342 = 13338 342 * 39 = 13338

Different types of Number Series Aptitude Notes Number Series What is Number Series? Number series is a arrangement of numbers in a certain order, where some numbers are wrongly put into the series of numbers and some number is missing in that series, we need to observe and find the accurate number to the series of numbers. In competitive exams number series are given and where you need to find missing numbers. The number series are come in different types. At first you have to decided what type of series are given in papers then according with this you have to use shortcut tricks as fast as you can . Different types of Number Series There are some format of series which are given in Exams. Perfect Square Series: This Types of Series are based on square of a number which is in same order and one square number is missing in that given series. Example :   1. 441, 484, 529, 576? Answer:  441 = 21^2, 484 = 22^2,  529 = 23^2, 576 = 24^2 ,  625 = 25^2. Perfect Cube Series:...

Problems on Trains - Aptitude Questions and Answers part -2  This is aptitude questions and answers section on "Problems on Trains" with explanation for various interview, competitive examinations and entrance tests. Candidates can practice the Problems on Trains Quiz, Problems on Trains MCQ, Problems on Trains Aptitude Questions, Problems on Trains Multiple Choice Questions and Answers from the below section. Problems on Trains Questions - Problems on Trains Quiz Details Test Name:   Problems on Trains Exam Type:  Multiple Choice Questions Category : Aptitude Quiz Number of Questions :  77 Problems on Trains Formulae: 1. km/hr to m/s conversion a km/hr = (a x5/18) m/s 2. m/s to km/hr conversion  a m/s = (a x18/5) km/hr 6. A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, what is the length of the platform? A. 120 m B. 240 m C. 300 m D. None of these Answer & Explanation A...

Problems on Trains - Aptitude Questions and Answers part -1 This is aptitude questions and answers section on "Problems on Trains" with explanation for various interview, competitive examinations and entrance tests. Candidates can practice the Problems on Trains Quiz, Problems on Trains MCQ, Problems on Trains Aptitude Questions, Problems on Trains Multiple Choice Questions and Answers from the below section. Problems on Trains Questions - Problems on Trains Quiz Details Test Name:   Problems on Trains Exam Type:  Multiple Choice Questions Category : Aptitude Quiz Number of Questions :  77 Problems on Trains Formulae: 1. km/hr to m/s conversion a km/hr = (a x5/18) m/s 2. m/s to km/hr conversion a m/s = (a x18/5) km/hr 1. The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is: A. 200 m B. 225 m C. 245 m D. 250 m Answer & Explanation Answer: Option C Explanation: Speed = [45 X 5/18] m/sec  = [25/2] m/sec Time...

Logical Reasoning Logical Deductions 1. Statement: Raman is always successful. No fool is always successful. Conclusions: I. Raman is a fool II. Raman is not a fool A. Only I follows B. Only II follows C. Either I or II follows D. Both I and II follow Answer : B. Only II follows Explanation :  Since both the premises are universal and one premise is negative, the conclusion must be universal negative and should not contain the middle term. So, II follows.  2. Statement: All trucks fly. Some Scooters fly. Conclusions: I.All trucks are scooters II. Some scooters do not fly A. Only I follows B. Only II follows C. Neither I nor II follows D. Both I and II follow Answer : C. Neither I nor II follows  Explanation :  Since the middle term "fly" is not distributed even once in the premises, so no definition conclusion follows 3. Statement: All grasses are trees. No tree is shrub. Conclusions: I. No grasses are shrubs. II. Some shrubs are grasses. A. Only conclusion I follo...

Logical Reasoning skills  Logical Reasoning Essential Part 1 1. Choose the word that is necessary for the word given in the question: Antique A.prehistoric B. aged C. artifact D. rarity  Answer : B. aged Explanation :  An antique is something that belongs to, or was made in, an earlier period. It may or may not be a rarity, and it does not have to be an artifact, an object produced or shaped by human craft . An antique is old but does not have to be prehistoric. 2. Choose the word that is necessary for the word given in the question: Itinerary A. guidebook B. travel C. route D. map  Answer : C. route Explanation :  An itinerary is a proposed route of a journey. A map is not necessary to have a planned route. Travel is usually the outcome of an itinerary, but not always. A guidebook may be used to plan the journey but is not essential. 3. Choose the word that is necessary for the word given in the question: Dimension A. measure B. inch C. ruler D. compass Answer ...