这道题不理解，请指教

飞行2010 · 发表于 2010-2-8 20:43:06

176.In 1995 Division A of Company X had 4,850 customers.If there were 86 service errors in Division A that year, what was the service-error rate, in number of service errors per 100 customers, for Division B of Company X in 1995 ?

(1) In 1995 the overall service-error rate for Divisions A and B combined was 1.5 service errors per 100 customers.

(2) In 1995 Division B had 9,350 customers, none of whom were customers of Division A.
题目读得糊里糊涂的，请大家帮我分析下，辛苦了。

Soulmaster · 发表于 2010-2-8 22:24:26

(86+b)/(4850+9350)=0.015
b=127
b/9350=1.36%

这道题不理解，请指教

所属分类: GMAT考试

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