math F.1 5 marks

題目應該係咁解：
一個數（你可以假設係Ｘ）的２/３係比６０的２０％多７。求Ｘ！

條式你可以咁樣寫：
(2/3)X = (60*20%) + 7
(2/3)X = (60*(20/100)) + 7
(2/3)X = 12 + 7
(2/3)X = 19
2X = 57
X = 28.5
希望你明啦!

2008-01-12 13:09:16 補充：
係呀, 你先要"Let the number be X"!!!

Let x be the no.
x(2/3) - 60乘20% = 7
x(2/3) - 12 = 7
x(2/3) = 19
x = 28.5

Let the number be o
o x 2/3=60 x 20% +7
o x 2/3=12 + 7
o x 2/3=19
o=28.5

Let the number be n
n x 2/3=60 x 20% +7
n x 2/3=12 + 7
n x 2/3=19
n=28.5