let x be his weight on the moon
He weighed 27.5 pounds on the moon.
3) Three tea bags are needed to make a gallon of iced tea. How many tea bags are needed to make four gallons?
let x be the amount of tea bags needed to make four gallons.
12 bags are needed to make four gallons.
16) A diagram measuring 20 cm long is reduced on a copy machine to 15 cm long. If the width of the original copy is 16 cm, what is the width of the reduced copy?