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The sixth grade elementary school people teaches printing plate mathematics winter vacation life the first page answer.
(a/8)(b/ 10)(c/ 15)= 1/2

abc=900=2? 3? 5?

a=25,b=9,c=4

25/8,9/ 10,4/ 15

a=75,b=3,c=4

75/8,3/ 10,4/ 15

a=225,b= 1,c=4

225/8, 1/ 10,4/ 15

This is a little beyond your study scope.