Answer:
1240 students
Explanation:
ratio of boys : girls = 11 : 9 = 11x : 9x ( x is a multiplier ) , then
11x = 9x + 124 ( subtract 9x from both sides )
2x = 124 ( divide both sides by 2 )
x = 62
total students = 11x + 9x = 20x = 20 × 62 = 1240
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