Given that the expression “p dollars for every q items” describes a unit price, which statement must be true?
p = 1
p = q
q = 1
pq = 1

if the pizza is divided equally into 2 equal halves then you would get

πr^2/2

where r is the radius of the pizza.

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cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x