Posted by babygirl on Sunday, September 18, 2011 at 10:29pm.
( 55 + 80 + 70 + x ) / 4 <= 65 Multiply both sides with 4
55 + 80 + 70 + x <= 65 * 4
55 + 80 + 70 + x <= 260
x <= 260 - 55 - 80 - 70
x <= 55
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