Question

Amina thinks of a number and sub 5/2 from it.she multiplies the result by 8.the result now obtained is 3 times the same number she thought of.what is the number?

Answer 1

Answer:

Let the no. be x

$x - \frac{5}{2}$

$\frac{2x - 5}{2}$

Now she multiplied it by 8. Therefore:-

$\frac{2x - 5}{2} \times 8$

We get :-

$(2x - 5) \times 4 \\ 8x - 20$

Now 8x-20 is 3 times of x. Therefore :-

$8 x - 20 = 3x$

$8x - 3x = 20$

$5x = 20$

$x = 4$

She thought of no. 4

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Answer 2

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Amina thinks of a number and subtracts 5/2 from it. She multiplies the result by 8. The result now obtained is 3 times the same number she thought of. What is the number?

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Let the number she thought be x

ATQ ,she subtract the 5/2 from the no.= x-5/2

She multiply the result by 8 =8(x-5/2)

Solution:-

• 3x = 8(x-5/2)
• 3x=8x -20
• 20=5x
• x=4

So, the number she thought is 4.

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