Question
In a class, the ratio of number of boys to that of girls
was 7:6 and total number of boys was 1960. When some more boys joined, the ratio became 8:7. Find the number of boys joined.Solution
Boys: Girls = 7:6 Number of girls = 6/7 × 1960 = 1680 Let boys be added x. So, number of boys = 1960 + x According to the question, => (1960 + x)/1680 = 8/7 => 1960 + x = 1920 => x = 40
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What will come in place of (?) question mark in the given number series.
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Find the missing number in the given number series.
512, 128, 32, 8, ?, 171, 79, 88, 152, ?, 393
15, 31, 67, 131, ?, 375
1, 26, 75, 156, 277, ?
7 29 61 ? 211 349
...18   29   16   31   ?   33
72, 82, 62, 102, 22, ?
?, 15, 45, 225, 1575, 14175
166    156    136   ?     66    16
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