Given: Total number of mangoes = 30,000
Spoiled mangoes = 25%
(4/5)th part of remaining mangoes sold
Calculation: According to the question
Number of spoiled mangoes = 30,000 × 25%
⇒ spoiled mangoes = 7500
⇒ Fresh mangoes = 30,000 - 7500 = 22,500
⇒ Number sold mangoes
=()×22,500 ⇒ 4 × 4500 = 18000
⇒ Remaining mangoes = 22,500 - 18000 = 4500
∴ The number of remaining mangoes is 4500