Question
In 2022, the ratio of boys to girls in a school was 8:7.
By 2023, 50 boys and 80 girls had left the school, while 90 new boys and 30 new girls joined. As a result, the ratio of girls to boys in the school changed to 3:4. Determine the total number of boys and girls in the school in 2022.Solution
Let the number of boys and girls in the school in 2022 be '8m' and '7m', respectively. ATQ: (8m - 50 + 90) :(7m - 80 + 30) = 4:3 Or, (8m + 40) ÷ (7m - 50) = (4/3) Or, 3 X (8m + 40) = 4 X (7m - 50) Or, 24m + 120 = 28m - 200 Or, 4m = 320 So, 'm' = 80 Therefore, sum of number of boys and girls in the school in 2022: = 8m + 7m = '15m' = 15 X 80 = 1,200Â
0Â Â Â Â Â Â Â Â Â Â Â Â Â 7Â Â Â Â Â Â Â Â Â Â Â Â Â 26Â Â Â Â Â Â Â Â Â Â 63Â Â Â Â Â Â Â Â Â Â 126Â Â Â Â Â Â Â Â 215
...Find the wrong number in the given number series.
16, 24, 36, 54, 81, 120.5
11Â Â Â Â Â Â Â Â Â Â 9Â Â Â Â Â Â Â Â Â Â Â Â Â 20Â Â Â Â Â Â Â Â Â Â 18Â Â Â Â Â Â Â Â Â Â 37Â Â Â Â Â Â Â Â Â Â 36
...- Find the wrong number in the given number series.
2, 27, 252, 877, 2102, 4127 Find the wrong number in the given number series.
8, 16, 24, 32, 32, 64
Find the wrong number in the given number series.
7, 15, 46, 93, 282, 561
324, 314, 294, 264, 224, 184
Find the wrong number in the given number series.
11, 30, 67, 133, 219, 346
In each of the following giving number series, a wrong number is given. Find out the wrong number?
82, 81, 86, 110, 168, 287
- In the given number series, find the wrong number.
3, 6, 12, 25, 48, 96, 192
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