Question
Robert gave one-half of his marbles to Dean. Then he gave two-thirds of the remaining ones to Mark. If he ended up with 10, how many did he have when he stsrted?
Answers
Ashley
The 10 marbles he had left would be the same as one-third, so multiply by 3 to get how many marbles he had after he gave half of them to Robert. 10x3=30. Since 30 is half of what he orginally had, multiply by 2. 2x30=60. He started with 60 marbles.