The question is just subtraction of fractions. First, you subtract the whole numbers. 10-2=8. Then you subtract the fractions. To do this, you have to make them equivalent. Just multiply the 1/4 by 2 and you get 2/8. Now, 7/8 - 2/8 = 5/8. Your final answer is 8 and 5/8
Tina said that 6:8 is equal to 36:64. It's wrong. It should be 48:64. Because just like a fraction, whatever you multiply in the bottom, you do to the top.
