Question
In a class of 40 students, the ratio of boys and girls
is 3 : 2 and the average marks scored by boys is 42 and by girls is 46. Then the average marks scored by the whole class is:Solution
1. Let the number of boys be 3x and girls be 2x, where 3x + 2x = 40 ⇒ x = 8. 2. Then, boys = 24 and girls = 16. 3. Total marks for boys = 24 × 42 = 1008. 4. Total marks for girls = 16 × 46 = 736. 5. Average marks for the class: 
0.15, 3.15, 12.30 , 45.90, 195.60, 998
1320, 1352, 1390, 1436, 1488, 1548
213, 215, 225, 257, 313, 393
Find the wrong number in the given number series.
24, 47, 76, 107, 144, 189
Find the wrong number in the given number series.
976, 720, 495, 297, 130, - 14Â
124, 132, 118, 140, 108, 148
- Find the wrong number, in the given number series.
1, 8, 27, 65, 125, 216 112, 222, 440, 872, 1717 , 3424
Find the wrong number in the given number series.
24, 120, 721, 5040, 40320, 362880
In each of the following giving number series, a wrong number is given. Find out the wrong number?
3023, 3132, 3246, 3356, 3471
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