A box was 3/4 full of marbles. The box fell on the floor. Thirty marbles fell out. This was 20% of the marbles in the box. How many marbles would a full box contain?

Answer: - 5.7

Step-by-step explanation:

3/4 - 30 = - 29.25 and that was only 20% of the box that was dropped out of the box. - 29.25 of 20% equals - 5.85. 3/4 of 20% equals 0.15 subtract the 2 decimals and you will get - 5.7