Subtracted 82507

I think two numbers. Their ratio is 5:7. If 3 is subtracted from the first and 7 from the second, then the ratio is 6:7. What number was I thinking?

Final Answer:

a =  15
b =  21

Step-by-step explanation:

b=21   Verifying Solution:  r1=a:b=15:21=750.7143=5:7 r2=(a3)/(b7)=(153)/(217)=760.8571



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