If p + q = 36, and p - q = 20, then q = ?

q = 8

Step-by-step explanation:

Given the 2 equations

p + q = 36 → (1)

p - q = 20 → (2)

Add the 2 equations term by term

2p = 56 (divide both sides by 2)

p = 28

Substitute p = 28 into (1)

28 + q = 36 (subtract 28 from both sides)

q = 8