Answer:
9 students have braces
Step-by-step explanation:
honestly, you could just probably solve it mentally but we are going to make a proportion.
5*3 = 15; so you then multiply 3 by 3 and get 9 as your final answer
Part a you would divide 465 with 49 and then subtract 25 dollars
To simplify this ration we need to divide each member of ration with same number.
We can start with 2.
18/2: 30/2 : 72/2 or
9:15:36
Now we can divide by 3 because 15 isn't divisible by 2.
we get:
3:5:12
This ration cannot be simplified further.
4( y-3) +9y is equal to:
Using ditributive property,
4 * y = 4y
4 * 3 = 12
Its equal to:
4y - 12 + 9y
Its also equal to:
9y + 4y = 13y
13y - 12
You have to add 15+30+12+18...
So she started with $75.
Hoped I helped!
Good luck!