7x123 = 861cm (total height)

This is the total height of all 7 students. From this we must subtract the person of height 147cm.

861 - 147 = 714 cm

Then divide by 6.

714 / 6 = 119cm

So your answer was correct, but in your working out you made two small mistakes which cancelled out.

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Mujavid Bukhari
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3 years ago


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