Rajesh walked 10 kilometers less than 4 times the distance that Hiro walked. Together they walked 25 kilometers. How many kilometers did Rajesh walk?
Let's think step by step.
18
Let H = distance Hiro walked.

4H - 10 = distance Rajesh walked.

H + 4H - 10 = 25.

5H - 10 = 25.

5H = 35.

Hiro walked 7 km so Rajesh walked 4(7) - 10 = 18 km.

Rajesh walked 18 kilometers.

.

Thus, the answer is 18