7-2) How many triangles are there?
7-3) Which fraction is the smallest?
7-4) If A # B = (A x B) / (A + B)
a) Calculate 9 # (10 # 10)
b) Calculate 8 # (5 # 5)
7-5) Max started to read a novel. He read 15 pages a day. After 6 days he had 3/8 of the book left. How many pages are there in the book?