The average of three distinct prime numbers between 50 and 75 is 191/3 .Find teh difference between the largest and the smallest prime numbers?

18

12

10

4

none of these

Correct Answer : E

A number exceeds its four seventh by 18. What is the number

If m and n (n > 1) are whole numbers, such that mn = 121, the value of (m – 1)n + 1 is

Five sixth of a number is more than 30% of another number by 25. What is the ratio of the first number to the second number