Homework Help: math

Posted by Ella on Sunday, October 2, 2011 at 9:28am.

540 kg of dry concrete mixture is to be spread over three surfaces in the ratio equal to that of their areas.If their areas are 9 square m,11 square m and 16 square m,how much is used on each surface?

math - Damon, Sunday, October 2, 2011 at 10:32am
9+11+16 = 36
9/36 = 1/4 = .25
11/36 = .306
16/36 = .4444

,25 * 540 = 135
.36 * 540 = 165
.4444 * 540 = 240

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