若有40元,最多可買雞湯多少盒?數學百分率的應用~~help

a) 76.8÷6×18
=12.8×18
=230.4
====
買18盒雞湯要230.4元。

b)40÷12.8
=3.125
=3(盒)
====
若有40元,最多可買雞湯3盒。

(a)
(76.8除6)x18
=230.4元

(b)
40除12.8
=3.125
=3盒

半打雞湯=6盒雞湯
a) 76.8 x 3 =230.4元
b) 40/(76.8/6)=40/12.8(12.8=1盒雞湯)=3盒...1.6元=3盒

市場內半打雞湯售76.8元
半打=6
所以把76.8除6就可以知道一盒既錢
=12.8元

a) 買18盒雞湯要多少元?
由於一盒12.8元,買18盒=12.8*18
=12.8*18
=230.4元

b)若有40元,最多可買雞湯多少盒?
由於一盒12.8元,要買40盒=40/12.8
=3.125
但是一盒就係一盒,唔可以有一半,正例如:人,都係唔可以有一半
所以,答案一定係要整數
所以答案係3盒

半打雞湯售76.8元
______________
Let x be the price of 18 packets of chicken soup:
(x/18)=76.8/6
x=230.4
__________________
(40/(76.8/6))
=3.125

So, he can buy 3 packets of chicken soup in $40
_______________________________
I used ratio to solve the question,you will learn ratio soon............

2010-10-01 13:54:25 補充：
I used ratio to solve the question in Q1,you will learn ratio soon

2010-10-01 14:18:49 補充：
I used ratio to solve Q1,you will learn ratio soon

a)76.8除6乘18=230.4
b)40乘12.8=3