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In ABC, P, Q and R are the midpoints of AB, BC and CA respectively. If ar (ABC) = 40 cm2

, then ar (PBCR) =
By Ariana

In ABC, P, Q and R are the midpoints of AB, BC and CA respectively. If ar (ABC) = 40 cm2

, then ar (PBCR) =

_____ cm2​

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Ariana

The mean of 5 numbers is 40. If the mean ofthe first 2 numbers is 45 and that of last 2is 42. Find the third number.

if a×=b y=c z and b²=a∗c,prove that y=2xz/z+x

answer this question please ​

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