Answer:
Step-by-step explanation:
Given
Required
The size of 
of height 
First, we calculate the width using the following equivalent ratios
Express as fraction
Solve for x
Hence:
--- approximated
So, we have:
The size (diagonal) is then calculated using:
--- approximated
15x+$38.50=$100
x being however much she can spend on each friend
x= $12.30 if you need that too
For the answer tot he question above, let the number of t-shirts are represented by 't'
number of sweaters are represented by 's'
cost of 1t=10 and cost of 1s=20 so
10t+20s=2000 or (factor out the 10 if you want to simplify)
10(t+2s)=10(200)
divide both sides by 2
t+2s=200
