Question

Help Please!

（Algebra）

I know the answer but I want to know the process.

The correct answer is "6" times, but why?

Lakshmi is trying to throw basketballs through hoops at a fair. If a ball goes through a hoop, she receives 50p, but if it does not she has to pay 20p for the shot. After 15 shots, Lakshmi finds she has made a profit of £1.20. How many times did Lakshmi successfully throw a ball through a hoop?

Answer 1

Answer:

let x times Lakshmi successful through a ball through a hoop .

then unsuccessful shots are 15-x.

50x-20(15-x) = 120

30x =420

x=14