self Maths Puzzle

Calculate the number of bricks, each measuring 25cm12.57.5cm required to build a wall 6m long, 5m high and 50cm thick, while the mortar occupies 5% of the volume of the wall

Read Solution (Total 2)

wall's volume= 6*5*.5=15 cubic mt.
95% of wall's volume=15*95/100=57/4=14.25 cubic mt
no of bricks required=wall's 95% volume/each bricks volume=14.25/(25*12.5*7.5)*10^-6
=.57*10^6/12.5*7.5=6080
12 years agoHelpfull: Yes(6) No(2)

Number of bricks = (0.05*600*500*50/(25*12.5*7.5) = (30*500*50)/(7.5*25*12.5)= 4*20*4= 320
12 years agoHelpfull: Yes(0) No(5)

self Other Question

. A can do a piece of work in 24days. When he had worked for 4 days B joined him.
If the complete work is finished in 16 days form the beginning, in how many days can B alone finish the work?

(a) 24 days
(b) 18 days
(c) 36 days
(d) None of the above two circular metallic discs have a thickness of 15mm. Their areas are in the ratio of 9:1. The smaller dia disc is pressed against the bigger disc and rotated around it on a flat surface. How many times will the small disc rotate before it completes one cycle of the bigger disc: