Three numbers are in the ratio 3 : 5 : 7. The sum of its longest and smallest numbers equals the sum of the third number and 50. Find the third number? Select.
A) A)54
B) B)50
C) C)48
D) D)46
E) E)63
Let the numbers be 3x, 5x, 7x.   Largest number = 7x.   Smallest number = 3x.   Third number = 5x.   7x + 3x = 5x + 50   5x = 50 =&gt; third number is 50.   Answer:50
<result>B</result>
Three numbers are in the ratio 3 : 5 : 7. The sum of its longest and smallest numbers equals the sum of the third number and 50. Find the third number?