Answer:
I think first add the side 137+ 127 +118=382 / 382cm
 
        
             
        
        
        
Answer:
Distance travelled by Monarch butterfly = 2000 miles
 Distance travelled by desert locust  = 2800
Distance travelled by pink-spotted hawk moth= 7800 miles
Step-by-step explanation:
Let the distance travelled by Monarch butterfly  be "X" miles
Distance travelled by desert locust is equal to X + 800 miles
Distance travelled by pink-spotted hawk moth is equal to 4X -200 miles
The total distance travelled by the three is equal to 12600 miles

Distance travelled by Monarch butterfly = 2000 miles
 Distance travelled by desert locust  = 2000 + 800 = 2800
Distance travelled by pink-spotted hawk moth = 4 * 2000 -200 = 7800 miles
 
        
             
        
        
        
This is a proportion problem
Info needed: there is 36 inches in a yard
1/36= x/18
Cross multiply and divide 
18 x 1= 18
18 divided by 36= .5 or 1/2
Answer is 1/2
You could have also known that 18 inches was half of 36 inches. Which 36 inches equals one yard