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2016-01-24T11:37:53+08:00

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We will let:
x = the number of 25 centavo coin; and
130 - x = the number of 5 centavo coin

We will translate "the amount of the savings is 20.50 pesos" as;
0.25x + 0.05(130-x) = 20.50

we, will now solve for x
0.25x + 6.50 - 0.05x = 20.50
0.25x - 0.05x = 20.50 - 6.50
0.20x = 14.00
x = 14.00/0.20
x = 70

130 - x = 130 - 70 = 60
Therefore, the number of 25 centavo coin in a coco shell is 70.
and the number of 5 centavo coin is 60.

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