Question

a bus is full of passengers. if you count them by either twos, threes, or fives, there is one left. if you count them by seven there will be none left. find the least number of passengers in the bus?​

Answer 1

91.

Explanation:

The least number will be a multiple of 7 while the number - 1 will be a multiple of 2,3 and 5.

2*3*5 = 30 but 31 is not a multiple of 7.

2*2*3*5 = 60 but 61 is not divisible by 7.

2*3*3*5 = 90 and 91 is divisible by 7.