PSLE
Ivory had rubber duckies for sale. In the morning, she sold ²₇ of the rubber duckies. In the afternoon, she sold ³₇ of the remaining rubber duckies. After that, there were 60 rubber duckies left. How many rubber duckies did Ivory have at first?
Fraction of rubber duckies left after selling in the morning
= 1 - ²₇
= ⁵₇

Fraction of the remaining rubber duckies after selling in the afternoon
= 1 - ³₇
= ⁴₇

⁴₇ of remaining rubber duckies = 60
¹₇ of remaining rubber duckies = 60 ÷ 4 = 15
⁷₇ of remaining rubber duckies = 7 x 15 = 105

⁵₇ of total rubber duckies = 105
²₇ of the total rubber duckies = 105 ÷ 5 = 21
⁷₇ of the total rubber duckies = 7 x 21 = 147

Number of rubber duckies at first = 147

Answer(s): 147