RRB NTPC Previous Year Questions
1.If three numbers are in the ratio 2:3:5 and the twice their sum is 100. Find the square of the largest of the three numbers. A) 225 B) 625 C) 125 D) 100 ... Answer is B) Explanation: Given that three numbers are in the ratio 2:3:5 and the twice their sum is 100 Lets assume three numbers are a,b and c therefore, => 2(a + b + c) = 100 2x + 3x + 5x = 50( Given that three numbers are in ratio 2:3:5) =>x = 5 Therefore, largest number would be 25 and it's square would be 625. Show Answer 2.What is the compound interest on Rs. 48,000 for 2 years at 20 % p.a., if interest is compounded annually? 2(a + b + c) = 100 ,2x + 3x + 5x = 50 ,x = 5 A) 22500 B) 21120 C) 12500 D) 10000 ... Answer is B) Explanation: Amount =P(1 + 100 ) r n where P = Principal r = rate of interest n = number of years Amount after two years = = 69120 Compound Interest = 69120 - 48000 = 21,120 So , the answer would be option b)Rs. 21,120 Show Answer ...