45% of 40 is 0.45×40=18 girls
if x girls join then 56% of 40+x is 0.56(40+x)=18+x
22.4+0.56x=18+x
put together like terms
4.4=0.44x
<span>x=10 girls joined</span>
Answer:
m=7
Step-by-step explanation:
9m=4m+35
move variable to the left
9m-4m=35
collect like terms
5m=35
divide both sides by 5
m=7
A whole number. The number is 9, because 45/5 = 9.
