avarage weight of 12 students and a teacher is 42 kg if the weight of the teacher is 66 kg find the avarage weight of the 12 students
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ANSWER:
40 KG
Step-by-step explanation:
let the total weight of 12 students be 12x.
avgerage weight of 12 students and a teacher = 42 kg.
(12x + 66) / 13 = 42
=> 12x + 66 = 42 × 13
=> 12x = 546 - 66
=> 12x = 480
=> total weight of 12 students = 480 kg
avg. weight of 12 students = total weight of 12 students / 12
=> avg weight of 12 students = 480/12
= 40 kg
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