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Question 121
A 14.4 kg gas cylinder runs for 104 hours when the smaller burner on the gas stove is fully opened while it runs for 80 hours when the larger burner on the gas stove is fully opened. Which of these values are closest to the percentage difference in the usage of gas per hour, of the smaller burner over the larger burner?
Solution
Gas usage per hour of the larger burner =Â $$\ \frac{\ 14.4}{\ \ 80}$$
Gas usage per hour of the smaller burner = $$\ \frac{\ 14.4}{\ \ 104}$$
The required percentage =Â $$\ \dfrac{\ \ \frac{14.4\ }{80}-\ \frac{\ 14.4}{104}}{\ \frac{14.4\ }{80}}$$ = 1-Â $$\ \frac{\ \ 80}{\ 104}$$ =Â $$\ \frac{\ \ 24}{\ 104}$$ = 23.07
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