The average would be the total amount divided by the 2 groups, so the answer would be 37.5 years old.
Answer:
43
Step-by-step explanation:
90-47=43
Answer:
b=7
Step-by-step explanation:
We want to determine the positive base b in which:

The easiest way to approach this is to convert all the numbers to base 10.


Next, we factorize the resulting expression.

The positive value of b for which the equality hold is 7.
Angle A measures to 59 degrees.