The diameter of a roller is 84 cm and its length is 120 cm. It makes 500 complete revolutions to move once over to a level a playground. Find the area of the play ground. ANS 1580 Sq. m
A sells an article to B at a profit of 20% and B sell it to C at a profit of 25%. If C pays rs. 1200, then the cost price of the article originally is? a. 700 b. 600 c. 1000 d. 800
Two numbers are in the ratio of 3:5. If 9 be subtracted from each, then they are in the ratio of 12:23. Find the number? a. 15:28 b. 36:115 c. 33:55 d. 60:69
The diameter of a roller is 84 cm and its length is 120 cm. It makes 500
ReplyDeletecomplete revolutions to move once over to a level a playground. Find the area
of the play ground. ANS 1580 Sq. m
Explain how ???
Lateral surface area of roller
Delete=2πrh
=2*22/7*42*120
=31680sq.cm
Area of play ground
=31680*500
=15840000sq.cm
Convert sq.cm into sq.m
=15840000//10000
=1584sq.m
multiply no of revolution to surface are of roller to find the area of play ground
ReplyDelete