F.2 Maths
2007-02-16 6:19 am
There are 37 blue marbles ,red marbles and yellow marbles in a box .If the number of red marbles is twice that of the blues one ,and the number of yellow marbles is 5 more than that of the blues one ,how many marbles of each kinds are there?
回答 (2)
2007-02-16 6:30 am
✔ 最佳答案
Let the no of blue marbles be x, red be y and yellow be z37=x+y+z...1
y=2x...2
z=x+5...3
put 2 and 3 into 1
37=x+(2x)+(x+5)
32=4x
x=8
y=2*8=16
z=8+5=13
therefore, the total no of blue marbles is 8, red marbles is 16 and yellow marbles is 13
2007-02-16 6:31 am
let B be the number of blue marbles.
red marbles=2B
yellow marbles=5+B
B+2B+5+B=37
5+4B=37
4B=37-5
4B=32
B=8
∴there are 8 blue marbles
the number of red marbles=2(8)=16
the number of red marbles=5+8=13
red marbles=2B
yellow marbles=5+B
B+2B+5+B=37
5+4B=37
4B=37-5
4B=32
B=8
∴there are 8 blue marbles
the number of red marbles=2(8)=16
the number of red marbles=5+8=13
參考: myself
收錄日期: 2021-05-03 12:21:53
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