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(10. Five pupils have a mean mass of 51 kg.
Three of them have a mass of 49 kg,
53 kg and 52 kg. The fourth pupil is five
kilograms lighter than the fifth pupil.
What is the mass of the:
(a) fourth pupil?
(b) fifth pupil?​

Respuesta :

MathPhys

Explanation:

If the fourth pupil has a mass of x, and the fifth pupil has a mass of x+5, then the mean mass is:

51 = (49 + 53 + 52 + x + x+5) / 5

255 = 159 + 2x

x = 48

x + 5 = 53

The fourth pupil has a mass of 48 kg.

The fifth pupil has a mass of 53 kg.

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