Answer:
520
Step-by-step explanation:
Let the Ratio a:b:c be 7x:13x:20x Respectively.
So, Sum of Ratios is 520...
A+B+C = 520
7x+13x+20x=520
40x=520
x= 520/40
x= 13
Now, Put the value of x
A= 7x= 7×13= 91
B= 13x = 13×13= 169
C= 20x = 20×13= 260
Now Add the numbers if we get 520 it means all the three numbers are correct....
91+169+260= 520
