2:5000 -> 1:2500
5:12000 -> 1:2400
6:18000 -> 1:3000
4:16000 -> 1:4000
combined -> 4:11900 -> 1:2975
so, for 60000->60000/2975 = 12000/595 = 2400/119 ~ 2400/120 = 20
Answer B
GMAT Prep question
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jaspreet.sharma
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Hi....easy calculation way isankanas wrote:Thnks..!
(17 * 60000)/ 51000 = 20
Summing up both cols and then using unitery method.












