Question

Q1- If the cost of 37 pens and 53 pencils together is ₹320, while 53 pens and 37 pencils together cost ₹400. The cost of two pens = ?

Q2- The sum of a two digit number and the number formed by interchanging its digits is 110. If 10 is substracted from first number, the new number is 4 more than 5 times the sum of the digits in the first number. The first number is = ?

Q3- The denominator of a fraction is 4 more than twice the numerator. When both the numerator and denominator are decreased by 6, then the denominator becomes 12 times the numerator. Then the fraction is = ?

Q4- Ten years ago, father was twelve times as old as his son and after ten years father will be twice as old as his son. Then the present age of father = ?

Q5- A boat covers 32 km upstream and 36 km downstream in 7 hours. Also, it covers 40 km upstream and 48 km downstream in 9 hours. The speed of boat in still water = ?​

Answer 1

1. ans₹ 13.50

2.64

3.7/18

4.34

5.2km