Question

What is the value of x?

21


41


22


20

Answer 1

22

Explanation:

Answer 2

22

Explanation:

The triangles are similar, with the smaller one having half the dimensions of the larger one. Then the length of segment (x-1) is half of 42, so ...

x - 1 = 42/2 = 21

x = 22 . . . . . . . add 1 to find x