You can put it like this.
The ratio of 60 + x : 100 + x is equal to 100 + x : 140 + x,
where x is the constant added to a, b and c.
Hopefully you can find the answer after this.
The positive integers are,
11111, 1112, 1121, 1211, 2111, 221, 212, 122, 311, 131, 113, 32, 23.
So, there are 13 numbers that satisfy the condition.
Thank you!!
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