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Home / Doubts and Solutions/MAHARASHTRA OLD/Class 9/Mathematics

The dimensions of a room are 14m*10*6.5m. There are two doors and four windows in the room. Each door measures 2.5m*1.2m. Each window measures 1.5m*1m. Find the cost of painting the four walls at the rate of Re. 9.50 per sq.m?

Asked by Bhawna 20th March 2015, 8:00 PM
Answered by Expert
Answer:
L e n g t h equals 14 space m B r e a d t h equals 10 space m H e i g h t equals 6.5 space m A r e a space o f space t h e space f o u r space w a l l s equals 2 cross times h cross times open parentheses l plus b close parentheses equals 2 cross times 6.5 cross times open parentheses 14 plus 10 close parentheses equals 312 space s q space m. A r e a space o f space a space d o o r equals 2.5 cross times 1.2 equals 3 space s q space m A r e a space o f space t w o space d o o r s equals 2 cross times 3 equals 6 space s q. space m A r e a space o f space a space w i n d o w equals 1.5 cross times 1 equals 1.5 space s q space m A r e a space o f space f o u r space w i n d o w s equals 1.5 cross times 4 equals 6 space s q. space m T o t a l space a r e a space o f space d o o r s space a n d space w i n d o w s equals 6 space plus space 6 space equals space 12 space s q. space m A r e a space o f space t h e space w a l l s space t o space b e space p a i n t e d equals A r e a space o f space f o u r space w a l l s minus T o t a l space a r e a space o f space d o o r s space a n d space w i n d o w s equals 512 minus 12 equals 500 space s q space m R a t e space o f space p a i n t i n g space t h e space w a l l equals R s.9.50 space p e r space s q space m T o t a l space cos t space o f space p a i n t i n g space t h e space f o u r space w a l l s equals 500 cross times R s.9.50 equals R s.4750
Answered by Expert 22nd March 2015, 8:22 AM
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