bmartinez26
02.02.2021 •
Mathematics
There are 18 children in the playground. The ratio of boys to girls is 4:5 if 6 boys 6 girls join the 18 children, what is the new ratioof the boys and girls?
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Ответ:
3x-4y=26
2x+8y=-36
We will solve this system with gaus algorithm
We multiply first equation with number 2 and we get
6x-8y=52 => we add second equation to this and we get
8x=16 => x=2 => we replace x=2 in first equation and we get
3*2-4y=26 => 6-4y=26 => -4y=20 => y=-5
The correct answer is A.
Good luck!!!