Question 954957: the sun of the ages of 6 children born at intervals of 3 years each is 81. what is the age of the youngest ? Found 2 solutions by addingup, josmiceli:Answer by addingup(3677) (Show Source):
You can put this solution on YOUR website! Let's call the youngest a. The next is therefore a+3. And the one after that a+6:
a+a+3+a+6+a+9+a+12+a+15 = 81 Add on the left
6a+45= 81 subtract 45 on both sides
6a= 36 divide both sides by 6:
a= 6 The youngest child is 6.
Proof:
6+(6+3)+(6+6)+(6+9)+(6+12)+(6+15)= 6+9+12+15+18+21= 81 Correct.
You can put this solution on YOUR website! Let = the age of the youngest one
Their ages are: , , , ,
and
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The youngest is 6
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check:
Their ages are:
OK
