The following table shows the total number of students and the percentage of girls in different years in different schools. | School | Year | Total Students | % Girls | |--------|------|----------------|---------| | A | 1999 | 300 | 40% | | A | 2005 | 500 | 50% | | B | 1999 | 200 | 30% | | B | 2005 | 600 | 75% | | C | 1999 | 400 | 60% | | C | 2005 | 800 | 30% | Find the average number of girls in the three schools in 1999.

Correct answer: 140

Solution

For 1999, girls in A = 300 × 40% = 120, in B = 200 × 30% = 60, and in C = 400 × 60% = 240. Their average is (120 + 60 + 240) / 3 = 140.

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