Answer: 60 pounds
Explanation:
Hi, to answer this question we have to multiply the weight of Kiva's father box (x ) by the percentage 1- 0.65/100 , (since the decimal form of 0.65 = 65/100 and 1 is the whole weight of her father's box) . That expression must be equal to the weight of that box that Kiva carries.
Mathematically speaking:
x (1-0.65) =21
x 0.35 =21
Solving for x
x = 21/0.35
x = 60 pounds