The average age of a group of 30 children is 10.3 years. The average age of another group of 50 children is 8.7 years. Find the average age for all of the 80 children

9.3

Step-by-step explanation:

30*10.3 = 309

50*8.7 = 435

309 + 435 = 744

744 / 80 = 9.3

9.3

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6 hours 48 min

step-by-step explanation:

68÷5=13.6

13.6×30=408min=6 hours 48 min.

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