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Average marks of all the students = 1680/40 = 42 Applying Alligation we get 
Number of boys in the class = 5/8 × 40 = 25
13, 28, ?, 118, 238, 478
7, 8, 18, 57, 232, ?
12, 19, 32, ?, 76, 107
124, 180, 108, 198, ?, 220
5, 6, 14, 45, ?, 925
140, 146, 170, 224, ?, 470
What will come in place of the question mark (?) in the following series?
15, 16, 25, 50, 99, 180, ?
What will come in the place of questions (?) mark in the following questions.
53, 55, 61, 71, 85, ?
9000, 1800, 450, ?, 75, 75
3 4 10 33 136 ?
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