4 years ago

Nina can paint two 10 ft. by 12 ft. walls in 3 hours. She has to paint her house, and it has 7 walls this size

Mathematics

1 answer:

suter [353]4 years ago

3 0

Answer:

10.5 hours.

Step-by-step explanation:

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Step-by-step explanation:

$\angle ABC=4x+23\\\angle CBD=6x+7\\\angle ABD=130\textdegree \\\angle ABD=\angle ABC+\angle CBD\\\\\Rightarrow4x+23+6x+7=130\\\Rightarrow10x+30=130\\\Rightarrow10x=100\\\Rightarrow x=10$

Substitute the value of $x$

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