Hi, 

Let x represent number of 3 lb boxes of pecans

then (x-24) would represent the number of 2 lb boxes walnuts

question states:

3lb*x + 2lb(x-24) = 462lbs

5x - 48 = 462lbs

5x = 510lbs

x = 102, the number of 3 lb boxes of pecans 

102*3lb = 306lb would be the total weight of  the boxes of pecans



checking our answer

3*102 + 2 *78 =306 + 156 =  462 lbx 

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