find the value of x
if <FED=80°
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20% is given to be 80. Therefore, 100% = (100/20) x 80 = 5 x 80 = 400
Hence, x = 400
Solution 2: The Usual Algebraic Method
1 Per cent means a hundredth part or 1/100. ' Of ' means multiplication.
Therefore, 20% of x = 20. 1/100.x = x/5……………………….………..(1)
Given, 20% of x = 80…………………. ……………………..………………(2)
Equating (1) and (2),
x/5 = 80 Multiplying both sides by 5,
1.x = 5x80 This yields
x = 400
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