First we find the increase by multiplying the percentage with the base salary
8.70*(6/100)=0.522 that's the increase
then we add it to the base salary
8.70+0.522=9.222$
On the added picture you can see that graphs of functions

and

have two points of intersection. The x-coordinates of these points are the solutions of the equation

.
Hence, the approximate solutions are x=-1.9 and x=1.6.
Boys to girls ratio - 5 to 4.
5 + 4 = 9.
180 divided by 9 equals 20.
20 times 4 equals 80.
Step-by-step explanation:
It is solved above
no of children and adult are let as x and y respectively