QUICK!! F.3 Maths problems(40)
2017/06/21 07:24
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QUICK!! F.3 Maths problems(40)
1) If the height, length and width of a cuboid decreases by 10%, 50% and 20% respectively, find the percentage change in the volume of the cuboid.2)In a party, 60% of the participants are boys. If the no. of boys increases by 20% while the no. of girls decreases by 40%, find the percentage of boys n the... 顯示更多 1) If the height, length and width of a cuboid decreases by 10%, 50% and 20% respectively, find the percentage change in the volume of the cuboid. 2)In a party, 60% of the participants are boys. If the no. of boys increases by 20% while the no. of girls decreases by 40%, find the percentage of boys n the party. please shows steps.
最佳解答:
1) let Y be a lenght of cuboid the volume of cuboid is Y^3 height, length and width of a cuboid decreases by 10%, 50% and 20% respectively, the new volume is 90%Y x 80%Y x 50%Y =36%Y^3 percentage change in the volume of the cuboid =New volume / Cuboid volume =36%Y^3/Y^3 =36% 2)let the number of participants be T, the number of boy be N and the no of girl be G the no of T = 60%N+40%G no. of boys increases by 20% =60%N x(1+20%) =72%N the changed no of T =72%B+28%G the no. of girls decreases by 40% =28% x (1-40%) =16.8%G the total no of T=83.2%N+16.8%G the total no of N is 83.2%
其他解答:
1.是三個分別長寬高! 我的英文太爛了! 2.假設原有100人, 男生有60人, 女生40人 男生增加20%--->60x(1+20%)=72 女生減少40%--->40(1-40%)=24 總人數為72+24=96(人) 男生佔72/96=75%
QUICK!! F.3 Maths problems(40)
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發問:1) If the height, length and width of a cuboid decreases by 10%, 50% and 20% respectively, find the percentage change in the volume of the cuboid.2)In a party, 60% of the participants are boys. If the no. of boys increases by 20% while the no. of girls decreases by 40%, find the percentage of boys n the... 顯示更多 1) If the height, length and width of a cuboid decreases by 10%, 50% and 20% respectively, find the percentage change in the volume of the cuboid. 2)In a party, 60% of the participants are boys. If the no. of boys increases by 20% while the no. of girls decreases by 40%, find the percentage of boys n the party. please shows steps.
最佳解答:
1) let Y be a lenght of cuboid the volume of cuboid is Y^3 height, length and width of a cuboid decreases by 10%, 50% and 20% respectively, the new volume is 90%Y x 80%Y x 50%Y =36%Y^3 percentage change in the volume of the cuboid =New volume / Cuboid volume =36%Y^3/Y^3 =36% 2)let the number of participants be T, the number of boy be N and the no of girl be G the no of T = 60%N+40%G no. of boys increases by 20% =60%N x(1+20%) =72%N the changed no of T =72%B+28%G the no. of girls decreases by 40% =28% x (1-40%) =16.8%G the total no of T=83.2%N+16.8%G the total no of N is 83.2%
其他解答:
1.是三個分別長寬高! 我的英文太爛了! 2.假設原有100人, 男生有60人, 女生40人 男生增加20%--->60x(1+20%)=72 女生減少40%--->40(1-40%)=24 總人數為72+24=96(人) 男生佔72/96=75%
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