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Anonymous
The average of 55 and 90 is 72.5
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It is: (55+90)/2 = 72.5
90% of 55= 90% * 55= 0.9 * 55= 49.5
55% of 90= 55% * 90= 0.55 * 90= 49.5
90 - 55 = 35
55+35 = 90
1) 5x2-55=90 +55 +55 2) 10x=145 /10 /10 x=14.5