ALGEBRA QUESTION-
A gym offers regular memberships for $80 per month and off-peak memberships for $60 per month. Last month, the gym sold a total of 420 memberships for a total of $31,100. How many memberships sold were regular memberships?

Question

ALGEBRA QUESTION-
A gym offers regular memberships for $80 per month and off-peak memberships for $60 per month. Last month, the gym sold a total of 420 memberships for a total of $31,100. How many memberships sold were regular memberships?

kamibug · Answer

You can set up a system of equations.
Let r = regular memberships and p = off-peak memberships. 
r + p = 420
80r + 60p = 31100 
Solve the first equation for p then plug in the value into p in the second equation to solve for r, the regular memberships. :)