晓箐骑自行车从家里经过商店到学校,共走4.2KM的路程。从家里到商店的距离是从商店到学校的2/3。从家里到商店的距离是多少? A 2 KM 520 M B 2 KM 420 M C 1 KM 680 M D 1 KM 580 M

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Jawapan

Jawapan Paling Bijak!
2015-08-30T21:27:47+08:00
Home to school = 4.2 km
Home to store = 2/3 Store to school
Home to store = ?

Let say store to school is y km,
 \frac{2}{3} y + y = 4.2
 \frac{5}{3} y = 4.2
y = 4.2 X  \frac{3}{5}
y = 2.52 km

Thus, from home to school
 \frac{2}{3} X 2.52
= 1.68 km
= 1 km 680 m

The answer: (C) 1 km 680 m
2 5 2