Question 1207340
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Angelica has 84 bills consisting of ₱10 and ₱50. If the total amount of her money is ₱3250, 
how many pieces of each kind of bill does she have?
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        The problem is posed INCORRECTLY 
        and has no solutions in integer positive number of bills.



Indeed, it is clear that the total of 84 bills of P10 and P50 should be multiple of P20;

but 3250 is not a multiple of 20.



So, the situation described in this post, may NEVER happen in real life.