The average weight (in kg) of all the students in a class equals the number of students in the class. The increase in the average weight when a teacher of 21 kg is included equals the decrease in average weight when a student of 19 kg is included. The strength of the class is |
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(a) |
15 |
(b) |
10 |
(c) |
20 |
(d) |
17 |

The average weight (in kg) of all the students in a class equals the number of students in the class. The increase in the average weight when a teacher of 21 kg is included equals the decrease in average weight when a student of 19 kg is included. The strength of the class is |
|||||||

(a) |
15 |
(b) |
10 |
(c) |
20 |
(d) |
17 |

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