Question 23435
let x = $35 
let y = $25
x+y=400
y=400-x 

35x+25y=11500
35x+25(400-x)=11500
35x+10000-25x=11500
10x=1500
x=150 
y=400-(150)
y=250 

(150)= 150 sweatshirts
(250)= 250 tshirts