Your 14 years old and you don’t know how to do it haha
15/10 = 18-x/x is the ratio of the larger to the smaller triangle
Cross multiply:
15x = 10(18 - x)
15x = 180 - 10x
25x = 180
x = 7.2
Plug back in to check
15/10 = 1.5
18-7.2/7.2 = 10.8/7.2 = 1.5 :)
Answer:
I would say its 24 hope this helps
6 :)
no. of books: 1 2 3 4
combinations: 12, 13, 14, 23, 24, and 34
