PSLE
Victoria had rubber duckies for sale. In the morning, she sold ³₈ of the rubber duckies. In the afternoon, she sold ⁵₉ of the remaining rubber duckies. After that, there were 40 rubber duckies left. How many rubber duckies did Victoria have at first?
Fraction of rubber duckies left after selling in the morning
= 1 - ³₈
= ⁵₈

Fraction of the remaining rubber duckies after selling in the afternoon
= 1 - ⁵₉
= ⁴₉

⁴₉ of remaining rubber duckies = 40
¹₉ of remaining rubber duckies = 40 ÷ 4 = 10
⁹₉ of remaining rubber duckies = 9 x 10 = 90

⁵₈ of total rubber duckies = 90
³₈ of the total rubber duckies = 90 ÷ 5 = 18
⁸₈ of the total rubber duckies = 8 x 18 = 144

Number of rubber duckies at first = 144

Answer(s): 144