Penny had a bag of marbles. She gave one-third of them to Rebecca, and then one-fourth of the remaining marbles to John. Penny then had 24 marbles left in the bag. How many marbles were in the bag to start with?
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D. 96
2005-10-13 07:19:15 · 1 個解答 · 發問者 Frank 7 in 科學 ➔ 數學
penny有一袋彈珠,她把1/3給了Rebecca,又把剩下的1/4給了John,她最後剩下24個彈珠,問她原來有幾個?
設原來有X個
=>X*2/3*3/4=24
=>X=48
2005-10-13 07:38:03 · answer #1 · answered by 依鴻 3 · 0⤊ 0⤋