Question

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

Answer 1

Hey there,

p+q=36
p-q=20
Adding both equations we get 2p=56
So p=28 Putting in equation 1 we get 28-q=20
So q=8

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Answer 2

Here is the solution to your question
Given equations are:
p + q = 36  → 1 
p - q = 20   → 2

We have to find the value of q, 
i-e.   q = ?
Now add both the equations, we get
(p + q) + (p - q) = 36+20
p + q + p - q = 56
2p = 56
p = 56/2
p = 28
Put this value of p in equation (1), we get:
28 + q = 36
q = 36 - 28
q = 8
This is the required answer. Hope it will help you.