x, y, z are painter. \( X \) paint wall of area \( A \) in \( 10 hrs ., Y \) paints wall of same area in \( 20 hrs . x, y, z \) work together and finishes wall 2 A in 8 hrs. how many hours \( z \) need to paint wall of area A

x, y, z are painter. \( X \) paint wall... - Solved

Question 72

Mathematics Area Hard

x, y, z are painter. \( X \) paint wall of area \( A \) in \( 10 \mathrm{hrs} ., \mathrm{Y} \) paints wall of same area in \( 20 \mathrm{hrs} . \mathrm{x}, \mathrm{y}, \mathrm{z} \) work together and finishes wall 2 A in 8 hrs. how many hours \( z \) need to paint wall of area A

(A) 20

(B) 15

(C) 10

(D) 16

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Correct Solution: Option C

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