PSLE
Kimberly had rubik's cubes for sale. In the morning, she sold ⁵₉ of the rubik's cubes. In the afternoon, she sold ¹₄ of the remaining rubik's cubes. After that, there were 54 rubik's cubes left. How many rubik's cubes did Kimberly have at first?
Fraction of rubik's cubes left after selling in the morning
= 1 - ⁵₉
= ⁴₉

Fraction of the remaining rubik's cubes after selling in the afternoon
= 1 - ¹₄
= ³₄

³₄ of remaining rubik's cubes = 54
¹₄ of remaining rubik's cubes = 54 ÷ 3 = 18
⁴₄ of remaining rubik's cubes = 4 x 18 = 72

⁴₉ of total rubik's cubes = 72
⁵₉ of the total rubik's cubes = 72 ÷ 4 = 18
⁹₉ of the total rubik's cubes = 9 x 18 = 162

Number of rubik's cubes at first = 162

Answer(s): 162