16 typists working 8 hours a day can type 172 pages in 6 days. How many typists will be required to type 215 pages in 4 days if they work 6 hours a day?
40
Use the work formula \(\frac{M_{1}D_{1}H_{1}}{W_{1}}=\frac{M_{2}D_{2}H_{2}}{W_{2}}\).
Here M1 = 16, D1 = 6, H1 = 8, W1 = 172 and D2 = 4, H2 = 6, W2 = 215.
M2 = (16 × 6 × 8 × 215) ÷ (172 × 4 × 6) = 1,65,120 ÷ 4,128.
M2 = 40.
Hence, the answer is 40.
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