Solution #9: School Notes
If 6 boys fill 6 notebooks in 6 weeks,
then 12 boys fill 12 notebooks in 6 weeks,
and 12 boys fill 24 notebooks in 12 weeks;
If 4 girls fill 4 notebooks in 4 weeks,
then 12 girls fill 12 notebooks in 4 weeks,
and 12 girls fill 36 notebooks in 12 weeks;
Hence 12 girls and 12 boys fill 24+36=60 notebooks in 12 weeks.
Source: Longley-Cook, L. H.
Categories: Reasoning, Arithmetic, Rates, Poetic
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