一道数学题

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发表于 2022-3-27 17:39:45 | 显示全部楼层 |阅读模式

本帖最后由 Monday 于 2022-3-27 15:42 编辑

1 Mike, Robert and Steve have21 marbles in total. Steve has 3/7 of the total marbles. After Mike gives Robert two of his marbles. Robert has three times the number of Mike's marbles.

How many marbles does Robert have at the start?

A 7

B 5

C 6

D 4

E 9

Answer and explanation

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