1)there are 56 female passengers and 49male passengers in a double-decker bus.if75%of female passengers and42又7分6of male passengers are on the lower deck,find(a)the number of passengers on the upper beck(b)the percentage of passengers on the lower deck
2)in 三角形xyz,角x-角y=23度and角z=79度.搵角x和角y
Math(20marks)
2008-03-03 4:28 am
回答 (2)
2008-03-03 6:10 am
✔ 最佳答案
1.a) 75%of female = 56x 75%=4242 6/7% of male= 21
therefore, the number of passenger on the upper deck
= 56+49-(42+21)
=42
b) the number of passenger on the lower deck
= 56+49-42
= 63
%of passenger on the lower deck
=63/105 x 100%
=60%
x+y+z=180(angle sum of triangle)
x+y+79=180
x+y=101-------(1)
x-y=23---------(2)
(1)+(2)
2x=124
x=62
y=39
2008-03-03 5:21 am
I only can calculate no.2
AngleX-AngleY=23度
AngleX=23度+AngleY
AngleZ+AngleX+AngleY=180度(Angle sum of triangle)
AngleX+AngleY=101度
23度+AngleY+AngleY=101度
2AngleY=78度
AngleY=39度
AngleX=AngleY+23度
=39度+23度=62度
AngleX-AngleY=23度
AngleX=23度+AngleY
AngleZ+AngleX+AngleY=180度(Angle sum of triangle)
AngleX+AngleY=101度
23度+AngleY+AngleY=101度
2AngleY=78度
AngleY=39度
AngleX=AngleY+23度
=39度+23度=62度
參考: calculate by myself
收錄日期: 2021-04-29 20:27:02
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