Answer:
7/10 (seven tenth)
Explanation:
If 7 out of 10 sweets were eaten, then 7/10 of the sweets are gone.
Basically the way you do it, is add the amount of sweets you two ate together, which is 3 + 4 = 7 and there are 10 sweets in all, that's 7/10 of the sweets eaten all together.