If 20% of an electricity bill is deducted, then Rs 100 is still to be paid. How much was the original bill?
Answer: 125
Explanation
Let the original bill be x. After deduction of 20%, the remaining amount is Rupees 100. Expressing given information in mathematical form.
x - 20% of x = 100
Solving the mentioned mathematical equation to find the value of x.
x - 20/100x = 100
x - x/5 = 100
Taking L.C.M., which is 5.
5x - x = 5*100
Performing subtraction and multiplication.
4x = 500
Performing division to find the value of x.
x = 500/4
x = Rupees 125
So, the original bill is Rupees 125.
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