Chain Rule Practice Test 3 with solutions

Question : 7 of 10

Marks: +1, -0

If 4 cooks can prepare food for 20 guests in 2 hours, then how long will 3 cooks take toprepare food for 45 guests?

Solution:

4 cook + 20 guests = 2 hours
1 cook + 20 guests = (2 × 4) hours
1 cook + 1 guest =

({2×4}/{20})

hours
3 cooks + 1 guest =

({2×4}/{20×3})

hours
3 cooks + 45 guests =

({2×4×4}/{20×3})

hours
= 6 hours

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