Question

our 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?​

Answer 1

Answer:

168

Step-by-step explanation:

Let the four numbers be 3x,x,7x,5x

3x+x+7x+5x=336

16x=336

x=336/16

x=21

1st no. is 3x= 63

4th no. is 5x= 105

sum= 168

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Answer 2

Let the numbers be 3x,1x,7x and 5x.

Sum of four numbers = 336

Now, 3x + 1x + 7x + 5x = 336

=> 16x = 336

=> x = 336/16 = 21

So, x = 21

First no. => 3x = 3*21 = 63

Second no. => 1x = 1*21 = 21

Third no. => 7x = 7*21 = 147

Fourth no. => 5x = 5*21 = 105

NOW, sum of first no. and fourth no. = 63 + 105 = 168  

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