The grasshopper, the frog and the mouse had a jumping contest. The grasshopper jumped 39 inches. The frog jumped 17 inches farther than the grasshopper and the mouse jumped 28 inches farther than the frog. How far did the frog jump?
The grasshopper jumped 39 inches. 
The frog jumped 17 inches farther than the grasshopper. 
The mouse jumped 28 inches farther than the frog. 

So, the frog jumped 17 + 28 = 45 inches.