Question

The average mass of 3 boys is 75 kg.the average mass of 6 girls is 66 kg.what is the average mass of thr 9 children together?

Answer 1

Step-by-step explanation:

Sum of the ages of three boys = 3 × 75 kg

= 225 kg

Sum of the ages of six girls = 6 × 66 kg

= 396 kg

Sum of the ages of the nine children = 225 + 396 kg

= 621 kg

Average of the ages of the nine children = 621/9 kg

= 69 kg

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Answer 2

Answer:

average mass of 3 boys =x75 kg

average mass of 6 girls =y=66 kg

average mass of 9children=

=x+y/2=75+66/2=141/2=70.5kg

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