three angles of a quadrilateral are in the ratio 1 ratio 5 ratio 6 the mean of the these angles is 64 find the fourth angle
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See mean =sum of observations /no of observations IE ratio=1:5:6. Mean= 1x+5x+6x/3(given only 3ratios)=12x/3=64.x=64*3/12 .x=16 so the 3angles of ratio are16+5(16)+6(16)=192 so as sum of angles in quadrilateral =360. So fourth angle=360-192=168
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