P + q = 1000 p is 150 greater than q calculate numbers p & q

Because p is 150 greater than q we can substitute p like p = 150 + q.

When we plug this in it looks like this

(150 + q) + q = 1000

subtract 150 from the left side

q + q = 850

2q = 850

divide 2 to get q alone

q = 425