6men and 8 boys do piece of work in 10days while 26 and 48 boys in 2days , the time taken for 15 and 20 boys
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6men+8boys =10days
1men=8upon6 boys
15men=8upon 6 into 15 =20boys
so we can write that 15 m+20b =15b+20b
it is indirect variation, 6*10 upon 15= 4
so the time taken to complete the work for 15 and 20 boys is 4 days.
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