Question

Please help!!!!!!!

Answer 1

Divide by 3 get a remainder of 2
5, 8, 11, 14, 17, 20, ...
Divide by 5 get a remainder of 2
7 , 12, 17, 23, ...
Divide by 7 get a reminder of 5
12, 19, 26, 33, ...
 
And find a number in all three lists

Not the most convenient way for sure, but since 47 works it will not take too long