Question

Find a number such that two- fifth of the number is 4 more than 8

Answer 1

Solution :-

Let us assume that, the required number is x .

So,

→ (2/5) of x = 4 more than 8

→ (2x/5) = 4 + 8

→ 2x = 5 * 12

→ 2x = 60

→ x = 30 .

Verification :-

→ (2/5) of 30 = 12

→ (2/5) * 30 = 12

→ 2 * 6 = 12

→ 12 = 12 .

Therefore, required number is equal to 30 .

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let a and b positive integers such that 90 less than a+b less than 99 and 0.9 less than a/b less than 0.91. Find ab/46

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Answer 2

Given:

Two-fifth of the number is 4 more than 8

To find:

The required number

Step-by-step Solution:

Let the number be N

Two-fifth of a number:

$\dfrac{2}{5} \times n = \dfrac{2n}{5}$

According to the question:

Two-fifth of the number is 4 more than 8

$= > \dfrac{2n}{5} = 4 + 8$

$= > \dfrac{2n}{5} = 12$

$= > 2n = 12 \times 5$

$= > n = \dfrac{60}{2}$

$= > n = 30$

Verify:

$\dfrac{2}{5} \times 30 =4 + 8$

$12 = 12$

LHS = RHS.

Hence, Verified.

Hence, the required number is 30.