Question

A number decreased by 30% gives 84. Find the number

Answer 1

define number as x.

100 for 30

x for 84

$84 = \frac{x \times 30}{100} \\ 84 \times 100 = 30x \\ 8400 = 30x \\ \frac{8400}{30} = x \\ x = \frac{840}{3} \\ x = 280$

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Answer 2

30% = 30/100

x -30/100= 84

x-30 =84 ×100

x -30 = 8400

x = 8400+30

x = 8430