three year ago, the average age of a family of five members was 27 year. the persent average age is also 27 year after the inclusion of a child into the family. find the age of the child ?
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Total age before child =27×5=135
Average age after child is =
27=(x+150)÷6
162=x+150
X=12
Average age after child is =
27=(x+150)÷6
162=x+150
X=12
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the sp of 12 pens is equal to the cp of 15 pens.so what's the gain percent?
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