PSLE
Abi had flying saucers for sale. In the morning, she sold ¹₈ of the flying saucers. In the afternoon, she sold ²₇ of the remaining flying saucers. After that, there were 50 flying saucers left. How many flying saucers did Abi have at first?
Fraction of flying saucers left after selling in the morning
= 1 - ¹₈
= ⁷₈

Fraction of the remaining flying saucers after selling in the afternoon
= 1 - ²₇
= ⁵₇

⁵₇ of remaining flying saucers = 50
¹₇ of remaining flying saucers = 50 ÷ 5 = 10
⁷₇ of remaining flying saucers = 7 x 10 = 70

⁷₈ of total flying saucers = 70
¹₈ of the total flying saucers = 70 ÷ 7 = 10
⁸₈ of the total flying saucers = 8 x 10 = 80

Number of flying saucers at first = 80

Answer(s): 80