Eileen drove for 85 minutes. this is 21 more minutes than one third the number of minutes ethan drove. how do i put this into an equation?

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right