(1)
The cost of tea A is $30 per kg ,the cost of tea is $20 per kg .If w kg of tea A and (w+1)kg of tea B are mixed together ,and the cost of the mixed tea is $24 per kg .Find w.
(2)
Emma had a bag of glass beads.She used half of the beads to make a necklets.She and her sister then use 1/6 and 1/7 of the beads respectively to make two bracelets. If there are 16 glass beads left,find the original number of glass beads.
f.2maths
2007-08-18 12:23 am
回答 (3)
2007-08-18 12:40 am
✔ 最佳答案
1) $30 x W + $20 (W+1) x 1/(W+W+1) = $24$50W + $20 = $24 (2W+1)
$50W +$20 = $48W + $24
$2W = $4
W=2
2) let x be the original number of glass beads
x (1-1/2-1/6-1/7) = 16
x (42-21-7-6)/42 = 16
x = 16 (42/8)
x = 84
2007-08-18 12:44 am
(1) 列方程 30w+20(w+1) ÷ w+(w+1) = 24
w = 2
(2) 設 the original number of glass beads 為m
(1- 1/2 -1/6 -1/7)m=16
4/21 m=16
m=16x 21/4
m=84
w = 2
(2) 設 the original number of glass beads 為m
(1- 1/2 -1/6 -1/7)m=16
4/21 m=16
m=16x 21/4
m=84
參考: 自己
2007-08-18 12:42 am
(1) [30w + 20(w+1)] / (w+w+1) = 24
(50w+20) / (2w+1) = 24
50w + 20 = 24(2w+1) = 48w + 24
2w = 4
w = 2
(2) Let x be the original number of glass beads.
x - x/2 - x/6 - x/7 = 16
8x/42 = 16
x = 84
(50w+20) / (2w+1) = 24
50w + 20 = 24(2w+1) = 48w + 24
2w = 4
w = 2
(2) Let x be the original number of glass beads.
x - x/2 - x/6 - x/7 = 16
8x/42 = 16
x = 84
參考: me
收錄日期: 2021-04-13 18:12:11
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