In the figure, the length of AC is 3 times the length of CD . If B is the midpoint of AC , and the length of CD is 5, what is the length of BD ?

×
10

✓
12.5

×
13.5

×
15

×
17.5
In the figure, the length of AC is 3 times the length of CD . If B is the midpoint of AC , and the length of CD is 5, what is the length of BD ?
10
12.5
13.5
15
17.5
AC = 3CD = 3\times 5=15
BC = \dfrac{1}{2}AC = 7.5
BD = BC+CD = 12.5