Reagan spends 26% of her weekly allowance on 2 banana splits. banana splits cost $3.25 each. how much does reagen recieve for her weekly allowance?

So lets go step by step, first lets see how much Reagan spent, that is 2 banana splits, $3.25 each, that is:
total spent = 2*3.25 = 6.50
So Reagan spent $6.50 of her weekly allowance, and the problem says that $6.50 represents 26% of her weekly allowance, the question is to find out how much represents the 100% of her weekly allowance.
We can solve this using a rule of three, simple, with direct proportion:
 26% > $6.50
100% > x
x = (100)(6.50)/26 = 650/26
x = 25
therefore Reagan's weekly allowance is $25