Simple calculation of 6 * 5 of 13 + 5 * 20 of 13

6 / 13 * 5 + 5 / 13 * 20
=5 out of 13 * 6 + 5 out of 13 * 20
=5 out of 13 * (6 + 20)
=5 / 13 * 26
=10

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