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1 year, 4 months ago
1 year, 4 months ago
Let's say price of petrol per gallon = $x and number of gallons bought earlier for same net price be y
x(y) = 180 ---(1) and with a discount of 10%, he/ she can get 5 gallons more ((90/100)x)(y+5) = 180 ---(2), on solving 1 and 2, we get original price to be $4.
Cheers.
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