標題:

Mathematics一問(three question)

發問:

1. A piece of land of area 1 320平方米 is divided amongX,Y and Z.The ratios of their shares areX:Y=2:3 and Y:Z=1:2,Find the area of Y's land?2. A sum of $72 is divided among A,B and C.The amount thatA gets is1/2 of B ang 1/3 of C.How much does each of them get?3. Rice of weight 94kg is divided into... 顯示更多 1. A piece of land of area 1 320平方米 is divided amongX,Y and Z.The ratios of their shares areX:Y=2:3 and Y:Z=1:2,Find the area of Y's land? 2. A sum of $72 is divided among A,B and C.The amount thatA gets is1/2 of B ang 1/3 of C.How much does each of them get? 3. Rice of weight 94kg is divided into three portions in the ratio 1/5:1/4:1/3. Find the weight of the smallest portion.

最佳解答:

1. 2X = 3Y X = 3Y/2 Z = 2Y The ratios of their shares: 3Y/2 : Y : 2Y 3Y : 2Y : 4Y 3 : 2 : 4 Y = 320 / (3+2+4) x 2 Y = 320 / 9 x 2 Y = 71.11 2. B = 2A & C=3A The ratios of their shares: A: 2A: 3A: = $72 / 6 x 1 : $72 / 6 x 2 : $72 / 6 x 3 = $12 : $24 : $36 3. The ratios of their shares: 1/5 : 1/4 : 1/3 = 12/60 : 15/60 : 20/60 = 12 : 15 : 20 the weight of the smallest portion : 94kg / (12+15+20) x 12 = 94kg / 47 x 12 = 24kg

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