Question
The average age of a group of 20 students is 40 years.
Two persons of age 35 years and 30 years, left the group and 2 persons of age 40 years and 85 years, joined the group. Find the new average age of the group.Solution
Required average = {(20 × 40) – 35 – 30 + 40 + 85}/20 = 43 years
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5, 14, -2, 23, -13, 42 - Find the wrong number in the given number series.
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4, 9, 19, 39, 79, 159, 319 135, 148, 109, 174, 87, 200Â
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1, 3, 10, 21, 64, 129, 356, 777
86,142, 232, 364, 547
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3600, 1440, 576, 230.4, 92.24, 36.864
