Chain Rule Practice Test 1 with solutions

Question : 2 of 40

Marks: +1, -0

A bulb can light up 18 square feet room for 560 hours. Approximately, how many bulbs of the similar quality are required to light up 54 sq. feet room for 176 hours?

Validate

Solution:

18 sq. feet room + 560 hours = 1 bulb
1 sq. feet room + 1 hour =

1/{18×560}

54 sq. feet room + 176 hours =

{54×176}/{18×860}

~ 1 bulb

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