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標題:
Math(20marks)
發問:
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
最佳解答:
1.a) 75%of female = 56x 75%=42 42 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
其他解答:
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
Math(20marks)
發問:
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
最佳解答:
1.a) 75%of female = 56x 75%=42 42 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
其他解答:
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
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