數學問題 (急急急)

1.
父親的體重 = 36/(75%) = 48kg
父親比小明重(48-36) = 12kg
2.
方小姐原有的金錢 = 1680/(1-25%)/(1-30%) = $3200
三次共花去的金額 = (3200-1680)+320 = $1840
她三次共花去的金額佔該筆款項的百份之幾
=(1840/3200)x100%
=57.5%

1.27kg
2.a 22400

1)Y X 75%=36
Y=48
2a)Y(1-30%)(1-25%)=1680
;
Y =9600
b)9600x30%+9600x(1-30%)x25% +320/9600 x100%
;
; =?

1.父親重x kg
x kg乘以75%=36kg(方程式計算)
x=36除以100乘以75
x=48kg

2.(a)1680除以25%除以30%
=22400
(b)1680減320
_________ 乘以100%
1680

1. (36/0.75)-36
=48-36
=12kg
2a.1680除(1-0.25)再除(1-0.3)
=2240/0.7
=$3200
2b [(3200-(1680-320)]/ 3200乘 100%
=57.5%

設父親的體重為a
75%a=36
a=36/75%
a=48
父親的體重為48kg.