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23 January, 06:30

jenny is 6b years old. Her brother is half her age and her sister is 4 years older than jenny. What is the average age of the three siblings in terms of b?

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  1. 23 January, 06:56
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    5b + 4/3

    Step-by-step explanation:

    So if Jenny is 6b and her brother is half that he must be 3b. If her sister is four years older than her then she must be 6b + 4. To find the mean (or average) you add all the numbers and then divide by how ever many things you added together, so you would do:

    Average = (6b+3b+6b+4) : 3

    = (15b+4) : 3

    = 5b + 4/3
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