For problem 5: A, C, and E
1b + 1b + 1b + 1b is 4b
2b + 2b is 4b
b/ 1/4 = 1b/1 x 4/1 = 4b/1 = 4b
For Problem 4:
A. 35 x 91 = 3185
35 x 89 = 3115
3185 - 3115 = 70
B. 22 x 87 = 1914
22 x 13 = 286
1914 + 286 = 2200
C. 9/11 x 7/10 = 63/110
9/11 x 3/10 = 27/110
63/110 - 27/110 = 36/110 / 2 = 18/55
