analyse

The number of tomatoes multiplied by 2,

It can be divided by 3 to 1,

(2×2=4=3+ 1)

Divided by 5, 1,

(3×2=6=5+ 1)

Divided by 7, 1,

(4×2=8=7+ 1)

The least common multiple of 3, 5 and 7 is 105.

So, the number of tomatoes is

( 105+ 1)÷2=53