Aflati numerele x,y,z stiind ca sunt direct proportionale cu 2,5,7 si ca produsul lor este 560

Okay Let's start,
T-shirt=50
Hat=70
Shoes=180
Skirt =X
Average price for all of this is 120
So (50+70+180+X)/4=120
solve this equation and you get that X which is the skirt is 180$

Test(1)=10
Test(2)=10
Project=15
Final exam=65
He got 8.8 in test one and 6.6 in test two 14.85 in the project and 45.5 in the final exam (I converted the percentages into a percentage relative to the total percentage )
so he got as a total 8.8+6.6+14.85+45.5=75.75%