Marco wants to lift no more than 80 pounds with a weightlifting machine. Right now, the machine is set at 20 1/4 pounds, and each additional plate that can be added weighs 5 1/4 pounds. What is the maximum number of additional plates that

Marco can add when setting up the machine?

answer: ok

step-by-step explanation:

could you reply to this with the question so i can ?

tip $2.90

total $17.40

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15