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A Word Problem II
Source: Beat The GMAT — Data Sufficiency |
You are actually looking for the ratio of defective chips for the four shipments to the total number of chips. This is equal to (2 + 5 + 6 + 4)/(5 000 + 12 000 + 18 000 + 16 000) = 17/51 000 = 1/3 000. This means that 1 chip in 3000 is expected to be defective. Since you have 60 000 chips, you should expect to have 60 000/3 000 = 20 defective chips
