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中一maths
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發問:
急............. The value of a is 4 times that of b.If their sum is 45,find the value of a.
最佳解答:
The value of a is 4 times that of b.If their sum is 45,find the value of a. a=4b-------(1) a+b=45----(2) From (1): b=a/4------(3) Put (3) into (2): a+(a/4) = 45 (4a+a)/4=45 4a+a=180 5a=180 a=36 Hope I can help you 圖片參考：http://hk.yimg.com/i/icon/16/1.gif
其他解答:
a=4b a+b=45 ie (4b)+b=45 5b=45 b=9 sub. b=9 into the formula a=4b ie a=4*9 =36 Help this can help
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