PSLE
Lucy had flying saucers for sale. In the morning, she sold ¹₅ of the flying saucers. In the afternoon, she sold ³₇ of the remaining flying saucers. After that, there were 64 flying saucers left. How many flying saucers did Lucy have at first?
Fraction of flying saucers left after selling in the morning
= 1 - ¹₅
= ⁴₅

Fraction of the remaining flying saucers after selling in the afternoon
= 1 - ³₇
= ⁴₇

⁴₇ of remaining flying saucers = 64
¹₇ of remaining flying saucers = 64 ÷ 4 = 16
⁷₇ of remaining flying saucers = 7 x 16 = 112

⁴₅ of total flying saucers = 112
¹₅ of the total flying saucers = 112 ÷ 4 = 28
⁵₅ of the total flying saucers = 5 x 28 = 140

Number of flying saucers at first = 140

Answer(s): 140