英语翻译Fifteenbandmenmbersfromyourschoolwereselectedtoplayinthestateorchestra.Twiceasmanystudentswhoplayawindinstrumentwereselectedasstudentswhoplayastringorpercussioninstrument.Ofthestudentsselected,onefifth

Question

英语翻译
Fifteen band menmbers from your school were selected to play in the state orchestra.Twice as many students who play a wind instrument were selected as students who play a string or percussion instrument.Of the students selected,one fifth play a string instrument.How many students playing each type of instrumengt were selected to play in the state orchestra?

Answer 1

15个校乐团的人被选中了,其中演奏弦乐string和打击乐percussion的人家起来是管乐器wind的两倍.15个人中,5分之1是弦乐的.那么选中的人中三种乐器的格是多少人?
number of students selected who play string instruments =15*(1/5)=3
let number of students selected who play percussion instruments be x.
15=3+x+(3+x)/2
x=7
number of students selected who play percussion instruments is 7.
(3+x)/2=10/2=5
number of students selected who play wind instruments is 5.