Answer:
He should have done 4/7 * 8/3 = 32/21
Explanation:
4/7 divide by 3/8 = 7/4 * 3/8 = 21/32
To divide 4/7 by 3/8, keep 4/7 and multiply by the reciprocal of 3/8, so do the multiplication below:
4/7 * 8/3
His mistake is using the reciprocal of the first fraction instead of the reciprocal of the second fraction.