three sets of English, mathematics and science
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eng--7 stacks
maths--5 stacks
science--2 stacks
each contain 48 books
so total stacks=7+5+2=14
see if this is helpful
maths--5 stacks
science--2 stacks
each contain 48 books
so total stacks=7+5+2=14
see if this is helpful
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