Let m be the math problems and s be the science problems. We have two equations:

(1) m + s = 42

(2) m = s + 10

Substitute (2) into (1)

(s + 10) + s = 42

Combine like terms

2s + 10 = 42

Subtract 10 from each side

2s = 32

Divide each side by 2

**s = 16**

So that means m = 16 + 10 -->

**m = 26**

(m, s) = (26, 16)

(m, s) = (26, 16)