My grandfather is twice as old as my grandmother was when my grandfather was half as old as he is at present. If they both live, in ten years time their joint ages will make 160 years. What are the present ages of the old couple?
Here is a problem about which people do not always agree. A rope is passed over a smooth pulley, and two monkeys of equal weight are hanging one at each end of the rope. One monkey climbs up his end, while the other remains hanging. Which will get to the top first?