题目:
To meet a government requirement, a bottler must test 5 percent of its spring water and 10 percent of its sparkling water for purity. If a customer ordered 120 cases of spring water and 80 cases of sparkling water, what percent of all the cases must the bottler test before he can send it out
A.6.5%
B.7.0%
C.7.5%
D.8.0%
E.(E) 8.5%
答案:
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参考答案:A, B, C, D