Roy is now 4 years older than Erik and half of that amount older than Iris

题目

Roy is now 4 years older than Erik and half of that amount older than Iris. If in 2 years, Roy will be twice as old as Erik, then in 2 years what would be Roy’s age multiplied by Iris’s age?

选项

解析

罗伊现在比埃里克大4岁→\( R = E + 4 \) 罗伊现在比艾里斯大上述年龄的一半→\( R = I + \frac{4}{2} = I + 2 \)（“上述年龄”指4岁） 2年后，罗伊的年龄会是埃里克的两倍→\( R + 2 = 2(E + 2) \)（罗伊和埃里克的年龄都增加2岁）那么2年后，罗伊的年龄乘以艾里斯的年龄是多少→\( (R + 2)(I + 2) =？ \) 求解得：\( R = 6 \)，\( I = 4 \)→\( (R + 2)(I + 2) = 48 \) 答案：C

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