devansh white washed 3/7 part of wall of his room,his younger sister helped himand she white washed 3/10 part of that of wall.how much part of wall was white washed by both of them and what part of wall is still to be white washed?
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Answer:
342 m^2
Area to be whitewashed=Area of 4 walls -(Area of door+Area of window)
Area to be whitewashed=LSA-(l*b + l*b)
=2h(l+b) - ( 4*2 + 2*1)
=2*8(12+10) - (8+2)
=16 * 22 - 10
=352 - 10
=342 m^2
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342^2 is your answer
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