Question 1011418
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After a drought, a village landlord decided to open the greenery for the villages. The distribution pattern was that in a family the youngest member get 2kg and in older to age member younger to him 1.5 more. 
1- If a family received 87.5kg. How many members of their family. 
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It is the sum of an arithmetic progression with the first term 2, the common difference 1.5 
and an unknown number of terms n.


{{{(2 + ((n-1)*1.5)/2)*n}}} = 87.5.

Solve it for n. Can you make it yourself?
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