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X-number of bags

160lbs+60x≤3000 lbs
60x≤2840 lbs
x≤47 1/3

Hope this helps =)
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Let X be the number of cement bags.

X(60 lbs) + 160 lbs ≤ 3000 lbs
X(60 lbs) ≤ 3000 lbs - 160 lbs
            X≤ (2840/ 60)
            X≤ 47                  (ans.)
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