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

the number of passengers is not a multiple of 2, 3 or 5 but it is a multiple of 7

The lowest multiple of 7 that is not a multiple of 2, 3 or 5 is 7

The next multiple after 7 that is not a multiple of 2, 3 or 5 is 49

7 x 1 = 7
7 x 2 = 14 ( can be divided by 2 )
7 x 3 = 21 ( can be divided by 3 )
7 x 4 = 28 ( can be divided by 2 )
7 x 5 = 35 ( can be divided by 5 )
7 x 6 = 42 ( can be divided by 2 )
7 x 7 = 49