"Problems and Recreations," by Ralph E. Winger, Ralph Leighton's great-uncle (after whom he was named). Winger was a graduate of Caltech, and Robert Leighton's  physics teacher at Los Angeles City College.

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* As number 26 is illegible (because of some yellowed cellophane tape), I will type it here:

26. Two men agree to dig n feet of ditch for n dollars. The start digging, one at each end, and finding that one end is harder to dig than the other, agree that one shall receive $1.25 an hour for his work, and the other 75 cents. Can they finish the job, and receive equal total pay?