Total mangoes = 25

Unripe mangoes = 7

Ripe mangoes = 25 - 7 = 18

Percentage is calculated by the formula below:

Substiting the number of ripe mangoes and the total mangoes into the percentage formula

Cancel the ones which can cancel out

Percentage of ripe mangoes = 18 x 4 = 72

Hence 72% of the mangoes are ripe

ALTERNATIVELY

You can as well calculate the percentage of the unripe mangoes and subtract it from 100% to get the percentage of the ripe mangoes

Total mangoes = 25

Unripe mangoes = 7

Substiting the number of unripe mangoes and the total mangoes into the percentage formula

Cancel the ones which can cancel out

Percentage of unripe mangoes = 7 x 4 = 28%

Percentage of ripe mangoes = 100% - 28% = 72%