Answer:
Step-by-step explanation:
boy count is 1476
Explanation:
There is an important difference between the way counts are viewed in ratio to that in fractions.
The ratio of boys : girls
→
4
:
5
so you have 4 boys and 5 girls making the whole count
+
=
9
in its simplest form.
So to change the ratio proportion into fraction proportion we have:
boys
of the whole.
girls
It is given that the whole is 3321 therefore the count of boys is:
×
3321
1476
-8x^2+8(10x)-72
When x=18
-8(18×18-(10×18)+9)
-72(36-20+1)
17×(-72)
=-1224
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