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Answer:
835.2
Step-by-step explanation:
Add the ratio together; 7+5=12
Divide; 835:12=69.5833333 / if needed, round the number with decimals -> 69.6
Multiply the number you have with each of the ratio numbers. 69.6×7=487.2 and 69.6×5=348
487.2+348=835.2
I hope this is right!!