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They must have a whole number of flags!

Tim could have $100$ flags but could he have less than $100$ flags?

$50$% of Tim's flags are blue, what does this tell you about the number of flags Tim must have?
As $35$% of Tim's flags are red, what does this tell you about the number of flags Tim must have?

It might help to be able to write $50$% and $35$% as fractions.