Question

a:(b+c)=5:7,c:(a+b)=1:2 then a:b=?​

Answer 1

Answer:

5:3

Step-by-step explanation:

From 1st: 7a = 5b+5c   -----(1)

From 2nd: 2c= a+b ==> c= (a+b)/2

put the value of c in (1), we get:

          7a = 5b + 5/2(a+b)

           14a = 10b + 5a +5b

           9a = 15b ==> a:b = 15:9 = 5:3