What is the probability that the sum of the digits of a 10-digit numberis divisible by 10?

1/5

1/10

1/15

1/20

none of these

Correct Answer : B

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