The answer to this math problem is 4
6*4=24/5=4.8
The two numbers are 4 and 5.
Part A = She incorrectly add 1 (4/4) with 3/4, so instead of getting 7/4 she got 8/4.
Part B=She needs 28/4 (7) cups for 4 batches because 4/1x7/4=28/4.
I don't see anything, but any line that doensnt have the right angle sign is not perpendicular.