折扣數學題–

(1)設乙為1，則甲為1.2。
(1÷1.2)×100％
=(1000÷12)％
=[83＋(1÷3])％


(2)設某數為y。

(2y÷3)=60×20％＋7
(2y÷3)=19
(2y÷3)×(3÷2)=19×(3÷2)
y=28.5
∴某數為28.5。

***************因為入分數很不容易，所以入除式。提你：要用分數寫！***************

(1) Let "乙" be A.
∵ “甲” is 20% more than "乙"
∴ “甲” = A × (1+20%) =1.2 A
∴ The percentage
=A ÷ 1.2 A × 100%
=83.33% (correct to 2 decimal places)

(2) Let the number be x.
2/3 x － 60 × 20% = 7
2/3 x － 12 = 7
2/3 x = 19
x = 19 ÷ 2/3
x = 28.5

(1)80%
(2)28.5

1)設乙是X, 則甲是1.2X
所以 X除1.2X
=1除1.2
=83.333...

2)設某數是Y
Y乘2/3=60乘20%+7
Y乘2/3=19
Y=28.5