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還能用20次,以下運算:
一瓶蓋為v 整瓶為c
20 × 1/2 = 10v
10v = 3/5cc= 10v ÷ 3/5c = 10v × 5/3c = 50/3v
2/5c = 2/5c × 50/3c = 20/3v ÷ 1/3v
剩下容量可使用的次數 = (20/3) ÷ (1/3) = 20次
所以接下來正確使用的話,還能再用 20次