Ok. Could I have a picture of the question? :)
Answer:
They studied for a little more than an our. A
Step-by-step explanation:
Because if you multiply 4 on 2/3 you get 8/12, then add 8/12 and 7/12 together to get 15/12 simplified 1 3/12.
Some fractions are 6/8, 9/12 and 12/16
All you have to do is multiply a number by the numerator and denominator