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5 July, 21:48

Le

The mean age of ten pupils is 12.7

years. Eight pupils are 11, 10, 12, 11,

14, 13, 14 and 16 years old. The ninth ||

pupil is two years younger than the

tenth. What is the age of:

(a) the ninth pupil?

(b) the tenth pupil?

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Answers (1)
  1. 5 July, 21:58
    0
    Total age of pupils

    = 12.7 x 10

    = 127 years

    127 - 11 - 10 - 12 - 11 - 14 - 13 - 14 - 16 = 26 (total age of the other 2 pupils added together)

    however, since the ninth pupil is two years younger,

    26-2=24

    24/2=12 (age of ninth pupil)

    12+2=14 (age of tenth pupil)

    thus, (a) 12 years old,

    (b) 14 years old.
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