Can anyone help solve this Algebra Review section ?

Ashopper bought a watermelon a pack of napkins and some paper plates in his state there was no tax on food the tax rate on non-food items is 5% the total for the three items he bought was 825 before tags and he paid $0.19 in taxes how much did the watermelon cost

If a baby uses 15 diapers in 2 days how many diapers will the baby use in a year

Solve 2x+y=3 x+y=5 in substitution method