The square of a positive number decreased by twice the number is 48. find the number

Let the required positive number is x.

The square of the number is

Now, we have been given that square of a positive number decreased by twice the number. It means we have

Now, it is equal to 48. Hence, we have

The number is positive, Hence, we have

Therefore, the required number is 8

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls