156.
John is twice as old as Mary was when he was as old as Mary is. John is now twenty-one. How old is Mary?
157.
In a cricket match A made 35 runs; C and D made respectively half and one-third as many as B, and B’s score was as much below A’s as C’s was above D’s. What did B, C, and D each score?
SETTLED BY REMAINDERS
158. What is the least number which, divided by 2, 3, 4, 5, 6, 7, 8, 9, or 10, leaves respectively as remainders 1, 2, 3, 4, 5, 6, 7, 8, and 9?