He used 2 18/80 which in simplified form is 2 9/40. Your welcome.
Sorry about no work but here it is.
9/16 x 2/5= 18/80 (Just multiply the numerator by the numerator and the denominator by the denominator)then you add the whole number which was two. 2 18/80
Now just find out if you can simplify it.
They can both be divided by two. So that is 18/80 divided by 2/2 = 9/40
Just multiply the numerator by the numerator and the denominator by the denominator.
