Answer=10 1/2 pounds
One pack has 1/4+1/8+1/16 pounds of snacks....
Lets starts off giving our fractions of 1/4, 1/8 and 1/16 a common denominator of 16.
1/4=4/16
1/8=2/16
1/16=1/16
So...
x=4/16+2/16+1/16
x=7/16
So... One pack has 7/16lbs of snacks in it
Multiply 7/16lbs by the total number of students(24)..
7/1624=10 1/2 pounds
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another way of solving this problem could be...
1/424=6
1/824=3
1/1624=1.5
6+3+1.5=10.5 pounds