1) 81-63=18
2) 480480:24 =20020
3) 4 х 18 = 72
4) 72 :2 = 36
5) 20020 - 36 = 19984
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1) 81-63=18
2) 480480:24 =20020
3) 4 х 18 = 72
4) 72 :2 = 36
5) 20020 - 36 = 19984