Question
Fri March 13, 2015 By: Vatsal Choudhary

The cost of painting the walls of the room 12 m long at the rate of Rs 1.35 per sq. m is Rs 340.20. And the cost of painting the floor at the rate of .85 paise per sq. m is rs 91.80. find the height of the room. Please also give the suitable diagram. Please give fast as tomorrow is my maths exam.

Expert Reply
Prasenjit Paul
Fri March 13, 2015
L e t space apostrophe h apostrophe space b e space t h e space h e i g h t space o f space t h e space r o o m. h cross times 12 cross times 1.35 cross times 4 equals 340.20 space left square bracket 4 space i s space m u l t i p l i e d comma space sin c e space t h e r e space a r e space 4 space w a l l s space i n space t h e space r o o m right square bracket h equals fraction numerator 340.20 over denominator 12 cross times 1.35 cross times 4 end fraction equals fraction numerator 34020 over denominator 12 cross times 135 cross times 4 end fraction equals 21 over 4 therefore T h e space h e i g h t space o f space t h e space r o o m space i s space 5.25 space m
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