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Whole Numbers (Pri-5)

/ Whole Numbers Clementi Primary School / Homework (2018)
The average height of a group of girls was 155 cm. When 15 boys joined the group, the average height became 158 cm. Given that the average height of the 15 boys was 165 cm, find the number of girls in the group. 14.
Li

October 8, 2018
 
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Answer 1 Comments 1
Oct 9, 2018 07:37 AM
Henry-M, thanks for your answer

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New Average Height = Total New HeightTotal B & G-> 155G + 165BG + B = 158-> 155G + 165 ( 15 )G + 15 = 158158G + 2370 = 155G + 24753G = 105G = 35  (ans)
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October 9, 2018
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