Question

What is the value of X

A 21
B 41
C 20
D 22

Answer 1

22

Explanation:

Let the bottom be y for the small triangle

So the total length of the bottom is 2y

We can use ratios to solve

x-1 1y

----- = --------

42 2y

Canceling the y's

x-1 1

----- = --------

42 2

Using cross products

2(x-1) = 42

Divide by 2

x-1 = 21

Add 1 to each side

x-1+1=21+1

x = 22