# Mr. santos paid 21.50 for two pads of note paper. He gave 30 coins of 1-peso and 50-centavo denominators. How many of each kind he give?

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y = 30-x

x = 1 peso

30-x = 0.50 centavo coin

1(x) + (30-x)(0.50) = 21.50

x + 15 - 0.50x = 21.50

x - 0.50x = 21.50 - 15

0.50x = 6.50

0.50x/0.50 = 6.50/0.50

Substitute 13 for x: