The rectangular floor of a warehouse is 300 feet wide and 350 feet long. => Area = 300* 350
If the width remains fixed, how many additional feet would have to be added to the length to increase the floor area by 20 percent?
Let new measurement = 300 feet by (350+x)
New floor area = 1.2 * Old floor area <= 20% increase = (1+20/100) = 1.2 *Old area)
=>300 * (350+x) =1.2*(300*350)
=> 350 +x = 1.2*350
=> x= 350 * 1.2 - 350 = 350(1.2-1) = 350 * 0.2 = 70
Answer: D
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If the width remains fixed, how many additional feet would have to be added to the length to increase the floor area by 20 percent?
Let new measurement = 300 feet by (350+x)
New floor area = 1.2 * Old floor area <= 20% increase = (1+20/100) = 1.2 *Old area)
=>300 * (350+x) =1.2*(300*350)
=> 350 +x = 1.2*350
=> x= 350 * 1.2 - 350 = 350(1.2-1) = 350 * 0.2 = 70
Answer: D
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