PSLE
Pamela had rubber duckies for sale. In the morning, she sold ⁵₉ of the rubber duckies. In the afternoon, she sold ⁵₈ of the remaining rubber duckies. After that, there were 30 rubber duckies left. How many rubber duckies did Pamela have at first?
Fraction of rubber duckies left after selling in the morning
= 1 - ⁵₉
= ⁴₉

Fraction of the remaining rubber duckies after selling in the afternoon
= 1 - ⁵₈
= ³₈

³₈ of remaining rubber duckies = 30
¹₈ of remaining rubber duckies = 30 ÷ 3 = 10
⁸₈ of remaining rubber duckies = 8 x 10 = 80

⁴₉ of total rubber duckies = 80
⁵₉ of the total rubber duckies = 80 ÷ 4 = 20
⁹₉ of the total rubber duckies = 9 x 20 = 180

Number of rubber duckies at first = 180

Answer(s): 180