If `(3a + 5b) : (3a - 5b)` = `5 : 1` then `a : b` = ?

If ( 3a+ 5b)/(3a- 5b) = 5 , then a: b is equal to

If (3a+2b) : (5a+7b) = 1:2 , then find a : b.

If a : b = 5 : 3, then (8a - 5b) : (8a + 5b) is equal to : यदि a : b = 5 : 3 है, तो (8a - 5b) : (8a + 5b) का मान क्या होगा ?

If (10a^3 + 4b^3) : (11a^3 - 15b^3 =7:5, then (3a + 5b) : (9a - 2b)=? यदि (10a^3 + 4b^3) : (11a^3 - 15b^3 =7:5 है, तो (3a + 5b) : (9a - 2b)=?

If (3a+5b):(3a-5b): :(3c+5d):(3c-5d) , then show that a,b,c and d are in proportion.

If b/a = 3/5 then (3a-5b)/(3a+5b) = ?

(a/3+b/5) (a/3-b/5) =___

If a : b = 2: 5 , then ( 3a+ 4b) : (5a +6b) is equal to