15.a)Andy's expendiyure of this month is 5% less than of last momth.iIf he spent $1 200 last month ,find his expendditure of this month.
b)If the expenditure of this month is 40% of his earnings.
MATHS
2006-10-29 9:39 pm
回答 (2)
2006-10-29 9:48 pm
✔ 最佳答案
a) 1200 X ( 1 - 5%) = 1140b) 1200 ÷ 40% = 3000
2006-10-29 13:50:38 補充：
Sorry, 睇錯... 更正b) 1140 ÷ 40% = 2850
2006-10-29 9:49 pm
a)
His expendditure of this month:
$1200 *(1+5%)
=$1200*1.05
=$1260
b題你想問咩呀？係唔係earning係幾多呀？
Ans:Let $x be his earning,
40%x=1260
0.4x=1260
x=3150
so His earning is $3150.
有不明的問我!
2006-10-29 14:16:18 補充：
sorry...答案應為:a) His expendditure of this month:$1200 *(1-5%)=$1200*0.95=$1140b題你想問咩呀？係唔係earning係幾多呀？Ans:Let $x be his earning,40%x=11400.4x=1140x=2850so His earning is $2850希望幫到你!!
His expendditure of this month:
$1200 *(1+5%)
=$1200*1.05
=$1260
b題你想問咩呀？係唔係earning係幾多呀？
Ans:Let $x be his earning,
40%x=1260
0.4x=1260
x=3150
so His earning is $3150.
有不明的問我!
2006-10-29 14:16:18 補充：
sorry...答案應為:a) His expendditure of this month:$1200 *(1-5%)=$1200*0.95=$1140b題你想問咩呀？係唔係earning係幾多呀？Ans:Let $x be his earning,40%x=11400.4x=1140x=2850so His earning is $2850希望幫到你!!
參考: me!!
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