Me! i need an equation and answers

Take the percent discount and flip it out of 100% so if the discount is 20% flip it to 80% then make that a decimal so .80 and multiply the original price by the decimal you found so 95*.80 and that's your sale price.

95 x .35 = 33.25
95 - 33.25 = 61.75 (Sale Price)

To Find The Original Price, Use the formula S=P−PD, where S equals the sale price of the
item, P equals the original price of the item, and D equals the discount percent of the item.

55.5 = P -P(.75)
55.5 = P(1-.75)
55.5 = P(.25)
Divide Both Sides By .25 To Get P By Itself
222 = P

She should use 12/3 to measure