The grasshopper, the frog and the mouse had a jumping contest. The grasshopper jumped w inches. The mouse jumped x inches lesser than the frog who jumped y inches farther than the grasshopper. How much farther did the mouse jump than the grasshopper?
The frog jumped 37 inches. 

The mouse jumped 21 inches. 

The grasshopper jumped 14 inches. 

The mouse jumped 7 inches farther than the grasshopper.