Trapezoid 80809

The house's roof is a trapezoid of the same name, with 85 tiles at the ridge and 100 tiles at the bottom. There is always one more bag in each row than the previous one. How many bags do I need for the entire roof?

Correct answer:

n =  1480

Step-by-step explanation:

a=85 b=100  r=ba+1=10085+1=16  n=2a+b r=285+100 16=1480   Verifying Solution:   n2=85+86+87+88+89+90+91+92+93+94+95+96+97+98+99+100=1480

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