Joh finished 16 minutes of his workout. He is 20% done. How long is his workout?

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

How do i get the answer for 2/3 * 10/3

What number should be added to both sides of the equation to complete this square? x^2-10x=7