Question

solve 5s + 40 55 using number sense

1. 3
2.15
3. 19
4.95

Answer 1

Did you mean:

5s + 40 = 55 ?
something + 40 = 55
so the something must be 15
5s = 15
something multiplied by 5 is 15
the something must be 3
so
s = 3