The perimeter of a triangle is 25 inches. If side a is twice side b, which is 1/2 side c, what is the length of side b?

A.) 5

B.) 8

C.) 10

D.) 15

A.) 5

B.) 8

C.) 10

D.) 15

**c = side c**

1/2c = side b{side b is half side c}

1/2c = side b

**c = side a**{side a is twice side b}

c + (1/2)c + c = 25 {added all sides and set equal to perimeter, 25}

2.5c = 25 {combined like terms}

c = 10 {divided each side by 2.5}

1/2(10) = side b {substituted 10, in for c, into 1/2c}

5 = side b {multiplied 1/2 by 10}

**A.) 5**

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