Kathy has 3/4 of a yard of fabric.she needs 3/10 of a yard for each doll dress she makes.how many doll dresses can she make

In order to calculate correctly, it is important that we are able to understand well the given values. we have

3/4 yard fabric = total amount of available fabric
3/10   yard= amount needed to make one doll

therefore,

number of doll dresses = 3/4 / 3/10 = 5/2 doll dresses 

Adult tickets cost $20, child tickets cost $15

Step-by-step explanation:

I'm going to assume that we have to say how much the tickets cost

x- cost of an adult ticket

y- cost of a child ticket

10x+3(115-5x)=245

10x+345-15x=245

-5x=-100

x=20

y=115-5*20=15