PSLE
Gem had mini-helicopters for sale. In the morning, she sold ¹₆ of the mini-helicopters. In the afternoon, she sold ⁴₉ of the remaining mini-helicopters. After that, there were 25 mini-helicopters left. How many mini-helicopters did Gem have at first?
Fraction of mini-helicopters left after selling in the morning
= 1 - ¹₆
= ⁵₆

Fraction of the remaining mini-helicopters after selling in the afternoon
= 1 - ⁴₉
= ⁵₉

⁵₉ of remaining mini-helicopters = 25
¹₉ of remaining mini-helicopters = 25 ÷ 5 = 5
⁹₉ of remaining mini-helicopters = 9 x 5 = 45

⁵₆ of total mini-helicopters = 45
¹₆ of the total mini-helicopters = 45 ÷ 5 = 9
⁶₆ of the total mini-helicopters = 6 x 9 = 54

Number of mini-helicopters at first = 54

Answer(s): 54