Four numbers are in the ratio of 3 : 1 : 7 : 5 respectively. If the sum of these four numbers is 336, then what is the sum of first and fourth number?
Let the four numbers be 3x,x,7x,5x
Sum of the four numbers = 3x+x+7x+5x = 16x
Given, 16x = 336 => x = 21
Then, the numbers are,
3x = 3*21 = 63
x = 21
7x = 7*21 = 147
5x = 5*21 = 105
Therefore, Sum of first and fourth numbers is 63+105 = 168.
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