the average age of four brothers are 25 years what is sum of their age?
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37 years
Average age of 4 brothers =12yrs.
Total age of 4 brothers =4×12=48yrs.
Average of 4 brothers + mother = (5 persons)
=12+5=17yrs.
∴ Total age of 4 brothers+mother =5×17=85yrs.
∴ The age of mother =85−48=37yrs.
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