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750+5x=1200+5y;
5x-5y=450;
x-y=\(\frac{450}{5}\);
x-y=90;
Therefore, the differences between the two values has to be 90.

On going through the options, the only possible values are 250 and 160.
So family A made 5 payments of 250$ each and family B made 5 payments of 160$ each.
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