the average age of 2 brothers is 9 years. It is increased by my nine years when their mother's age is added, then the age of their mother is?
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36
Step-by-step explanation:
mean is 9 so sum of the ages is 18 and they said the mean was increased by 9 so mean is 18 when mom is added then sum of ages is equal to 54
54= mom age + sum of brothers age
54=mom age + 18
mom age =54-18
mom age =36
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