Answer:
136
Step-by-step explanation:
First you need to know that there are 2 triangles in the image.
One triangle (the smaller one) has sides that measure 119 (the side) and 56 (the bottom).
The other triangle (the bigger one) has sides that measure 119 + ? (the side) and 120 (the bottom).
Let's replace the 119 + ? with an x so that the entire side length of the big triangle measures x.
1. Make a proportion using ratios. For the ratios of each triangle, we can do side over bottom lengths and then set them equal to each other.
119 = x sides
56 120 bottoms
2. You can cross multiply, or just solve for x.
119*120= 14280
14280/56= 255
3. Then subtract the total length minus 119 to find the question mark
255 - 119 = 136
