Question
The average age of a group of 70 students is 14 years.
If three students whose ages are 22years, 20years, ________ years is replaced with three new student whose ages are 19 years, ______ years, and 32 years, then the new average age is increased by 0.4 years. I. 17, 36 II. 22, 41 III. 15, 34Solution
The average age increased by 0.4 years. So, the difference of sum of ages of new student to the age of old student = 70*0.4 = 28 years (19+32+__x___) - (20+22+__y__) = 28 (x-y) + (51-42) = 28 x-y = 19 So, option I, II, and III all satisfy the above relation Hence, all three will be the answer.
More Average Questions
82, 98, 130, 178, 242, ?
562, 628, 698, ?, 850
- What will come in place of (?) in the given number series.
3, 9, 15, 21, ?, 33 - What will come in place of (?) in the given number series.
1, 8, 27, ?, 125, 216 11 6 7 12 26 ? 205.5
What will come in place of the question mark (?) in the following series?
11, 18, 32, 60, ?, 228What will come in place of the question mark (?) in the following series?
4000, ?, 320, 192, 153.6, 153.6
84, 63, ?, 283.5, 1701
Find the missing number in the given number series.
58, 86, 142, ?, 478, 926
24 12 ? 24 96 768
Relevant for Exams:
