4 9/10 is your answer because you first have to divide the numerator by the denominator. this will give you 4, with a remainder of 9. The mix number can be created by using the 4 as the whole number, the 9 as the numerator and the 10 as a denominator. So, 49/10 = 4 9/10. Hope this works!
after 4 days 88 boats will have passes under the bridge
I think the answer would be x= 4/7 y = +-16/7
Hmm. Try counting the side of the shape and add the sides. Using the sides as numbers you may be able to solve the problem.