Question
In a class of 55 students, the ratio of boys to girls is
5:6. The average weight of a boy exceeds the average weight of a girl by 8 kg. Additionally, the ratio of the total weight of all the boys to that of all the girls is 15:14. Determine the average weight of a boy in the class.Solution
Number of boys in the class = 55 X (5/11) = 25 Number of girls in the class = 55 - 25 = 30 Let the average weight of a girl in the class = 'y' kg Then, average weight of a boy in the class = (y + 8) kg Total weight of all girls in the class = 30 X y = '30y' kg Total weight of all boys in the class = 25 X (y + 8) = (25y + 200) kg According to the question, (25y + 200):(30y) = 15:14 Or, 350y + 2800 = 450y So, y = 2800 ÷ 100 = 28 Therefore, average weight of a boy in the class = 28 + 8 = 36 kg
Find the missing number, in the given number series.
6, 12, 36, ?, 720, 4320
In each of the following number series, one term is missing. Find the missing term.
4, 9, 16, 25, 36, ?
What will come in place of the question mark (?) in the following series?
120, 130, ?, 140, 100, 150
250 Â Â Â 25 Â Â Â Â 5 Â Â Â Â ? Â Â Â Â 0.6 Â Â Â Â Â 0.3
52, 77, 127, ?, 302, 427
- What will come in place of the question mark (?) in the following series?
712, ?, 576, 508, 440, 372 42, 48, 60, 84, 132, ?
1595, 1083, 740, 524, 399, ?Â
What will come in place of the question mark (?) in the following series?
80, 83, 88, 95, 106, ?
25, ?, 87, 159, 269, 425Â
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