Logical Puzzles

43. Jack is twice as old as Jill, but in five years time he will only be one and a half times as old. How old are Jack and Jill now?
Jack 10 and Jill 5.
44. If five men can build a house in 16 days, how long will it take just two men to build the same house, assuming all men work at the same rate?
40 days.
Five men take 5 × 16 = 80 man days to build the house.
Two men will, therefore, take 40 days to build the house
(80 ÷ 2 = 40);
45. What letter comes next?
A D H K O ?
Skip two letters then three, ie AbcDefgHijKlmnOpqR.