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?
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3x +x+7x+5x =336
=>16x=336
=>x=336/16
x=21
The first number =3x=3×21=63
The fourth number =5x=5×21=105
So the sum of 1st and 4th =63 +105 =168
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