Gmat Problem Solving: Doubt in Ratios

[Sunshine15]

Hello,

I am a new user and I hope this is the forum for asking questions pertaining to GMAT quantitative problems.

I have a doubt in framing an equation for the following question.

"The ratio of earnings to expenditure of A is 5:3 and B is 7:6. If the savings of A is twice of that of B, what would be the ratio of total earnings of A and B together to the total expenditure of A and B together"?

I appreciate the assistance . 

Thank you!

[Sunshine15]

*I forgot to mention the answer choices:

A) 4:3 B)3:5 C)5:3 D)2:1