Answer:
21
Step-by-step explanation:
There will be 18 girls in a group of 16 boys.
you divide 72 by 16 and get 4.5.
then you divide 81 by 4.5 and get 18.
That is how you get 18 girls in a group of 16 boys.
Hope that helped.
i thank it is B i hope that helped
The number of waffles there were initially is; 80 waffles
<h3>Simultaneous equations</h3>
Let the number of pancakes be x.
Let the number of waffles be y
Hence, after she baked 45 more waffles, and her grandchildren eat 12 pancakes, what she has is;
- y +45 waffles and x-12 pancakes.
There were 17 more waffles than pancakes.
- y+45 = x-12 +17.......equation (1)
And initially, x = 1.5y
Hence, to determine y, we must substitute x = 1.5y into equation (1)
Therefore, we have;
Read more on simultaneous equations;
brainly.com/question/16863577
Answer:
x=0, - 9
Step-by-step explanation:
x^2+9x=0
x(x+9)=0
x=0 or x=-9