The average age of a couple is 24 years when they were married five years ago but now the average age of the husband, wife and child is 20 years(the child was born during the interval). What is the present age of the child ?
Major and Squadron leader are equivalent ranks in Army and Air Force respectively . In the same way Lieutenant and Flying officer are equivalent ranks in Army and Air Force respectively.
In the figure, there are 9 columns containing 5 cubes each, 7 columns containing 4 cubes each, 5 columns containing 3 cubes each and 1 column containing 1 cube.
Total number of cubes = (9 x 5) + (7 x 4) + (5 x 3) + (1 x 1) = 89
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