2n-7/3 = 15 solve for n

1: 4 if the wew 35 surfboards at the beach how many were short boards?

Paco orders an ice cream for $1, but realizes his wallet is at home and he only has 3/20 of $1 with him. if his mom pays the remaining 7/20 of the dollar, how much will she pay? $0.05 $0.15 $0.85 $0.95

Five infinity stones cost $16.80. what is the price per infinity stone ?