Answer :
Answer: 385
Step-by-step explanation:
Mean the three groups of 10 kids=35
Total weight of 3 groups (10x35)=350
Mean weight of 3 groups and one boy ( 35 + 350)=385
Final answer:
The three new kids in the groups weigh respectively 35 kg, 47 kg, and 23 kg.
Explanation:
To solve this problem, it is useful to understand how averages work. In general, the average of a group of numbers is the total sum of all the numbers divided by the count of the numbers.
For the first group, his weight must therefore have been 35 kilograms (kg), because the average didn't change.
For the second group, the average increased by 1 kg after adding the new kid. This means that the new kid must weigh 1 kg more than the new average for 11 children. So, he weighs 36 kg + 1*11 kg = 47 kg.
For the third group, the average decreased by 1 kg after adding the new kid. This means that the new kid must weigh 1 kg less than the new average for 11 children. So, he weighs 34 kg - 1*11 kg = 23 kg.
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