Question

Q2. Find the number which when decreased by:​

Answer 1

Answer:

810 is correct answer.

Step-by-step explanation:

Let the number be'x'.

10/100 × x = 81

10x = 81 × 100

10x = 8100

x = 8100/10

x = 810

Answer 2

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★ Find the number which when decreased by 10% becomes 81 .

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$\longrightarrow \rm \: let \: that \: number \: be \: x.$

$\rm \: according \: to \: the \: question :$

$\mapsto \rm \: x - 10percent \: of \: x \: = 81$

$\implies \rm \: x - \dfrac{10}{100} \times x = 81$

$\implies \rm \: x - \dfrac{x}{10} = 81$

$\implies \rm \: \dfrac{10x - x}{10} = 81$

$\implies \rm \: 9x = 81 \times 10$

$\implies \rm \: x = 9 \times 10$

$\implies \boxed{ \rm{x = 90}}$