Question
The number of students in class A is 25% more than the
number of students in class B and the number of students in C is 20% more than the number of students in class A. If the ratio of then number of boys and girls in class A, B and C is 3: 2, 13: 7 and 12: 13 respectively, then the total number of girls in all the classes together is approximately what percent of the total number of students in all the classes together?Solution
ATQ, Let the total number of students in class B = 4x Then, number of students in class A = 5x And number of students in class C = 6x Total number of girls in all three classes = 2/5 of 5x + 7/20 of 4x + 13/25 of 6x = 2x + 7x/5 + 78x/25 = 163x/25 
= 163 ×( 4/15) = 43.46 ~ 43.5%
The question below is based on the given series I. The series I satisfy a certain pattern, follow the same pattern in series II and answer the question...
3, 49, 191, 477, ?, 1673
What will be the next number in the series?
2,5,11,23,47,?
38    40    83    254    ?     5126
24 47 137 ? 2679 16049
...10 625 50 125 250 25 ?
...[(288)2 ÷ 96 × ?] ÷ 44 = 432
1Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 2Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 6Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ...
3, 4, 10, 33, 136, ?, 4116
77 ? 190 257 331 412
...
