Make 37 Poster

It is impossible to make 37 with the numbers 1, 3, 5 and 7 if you add ten of them.

This is because when you add odd numbers an even amount of times, such as ten, then the result will be an even number.

37 is an odd number so you can't get it with those numbers when you add ten of them.

However if you were to add the nine or eleven of the numbers, then you could make 37.