Question

If 9by10 of a number is 81.find the number

Answer 1

Answer:

Let the number be x, so that

x × 9/10 = 81

or, x = 81 × 10/9 = 9 × 10 = 90

So, that number is 90.

To Check :-

90 × 9/10 = 81

or, 9 × 9 = 81

or, 81 = 81

LHS = RHS

Hence, Verified.

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Answer 2

Answer:

Let the number be x, so that

x × 9/10 = 81

or, x = 81 × 10/9 = 9 × 10 = 90

So, that number is 90.

To Check :-

90 × 9/10 = 81

or, 9 × 9 = 81

or, 81 = 81

LHS = RHS

Hence, Verified.

Step-by-step explanation: