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The seventh grade mathematics book 1 juvenile intelligence development reportNo. 10 Chapter 3 proficiency test (b) Answer No.2 1 0?
There are x students in Class A and (1 15-x) in Class B.

1/3 * x+( 1 15-x)* 2/5 * 10+( 1- 1/3)x * 5+( 1 15-x)*( 1-2/5)* 5

=x/3+460-4x+5-5x/3+345-3x

=8 10-26x/3

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