PSLE
Yoko had mini-helicopters for sale. In the morning, she sold ³₇ of the mini-helicopters. In the afternoon, she sold ⁵₉ of the remaining mini-helicopters. After that, there were 32 mini-helicopters left. How many mini-helicopters did Yoko have at first?
Fraction of mini-helicopters left after selling in the morning
= 1 - ³₇
= ⁴₇

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

⁴₉ of remaining mini-helicopters = 32
¹₉ of remaining mini-helicopters = 32 ÷ 4 = 8
⁹₉ of remaining mini-helicopters = 9 x 8 = 72

⁴₇ of total mini-helicopters = 72
³₇ of the total mini-helicopters = 72 ÷ 4 = 18
⁷₇ of the total mini-helicopters = 7 x 18 = 126

Number of mini-helicopters at first = 126

Answer(s): 126