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6 boys complete 6 notebook in 6 weeks
so, 6×2=12 notebooks can be completed in 12 weeks by 12 boys. 
Also, 4 girls complete 4 notebook in 4 weeks
so,4×3= 12 notebook can be completed in 12 weeks by 12 girls
total number of notebook by 12 boys and 12 girls = 12+12 =24
wrong answer qais..........
oops..i think...i didnt get the question