12 students are girls and 8 are boys.
4y+2x=14 ==> multiply this 1st equation by (-1) => -4y-2x=-14
Now add it up to the 2nd equation
-4y-2x=-14
2y+2x=10
-------------- And now add them up
-2y +0x=-4
==> -2y=-4==> 2y = 4 & y=2
Last step: plug y into any equation & you will find x=3
That would be 40%
Explanation:
2 divided by 5= 0.4
Move the decimal to the right twice is 40%
<span>denominator is </span>number below the line in a common fraction.
Here's picture to show what is a denominator: