1.

2 men and 7 boys can do a work in 4 days.the same work is done in 3 days by 4 men and 4 boys.how long would it take for one man and one boy to do it alone??

Answer»

ANSWER:

Step-by-step EXPLANATION: let no. of MEN be =X

let no. of  boys=y

first equation-2x+7y=4

second equation=4x+4y=3

2x+7y=4\\2x=4-7y\\\frac{4-7y}{2} =x

insert value of x in second equation

\frac{4-7y}{2} +4y=3\\\frac{4-7y+8y}{2} =3\\\\\frac{4+y}{2} =3\\\frac{4+y}{} =6\\ y=2

4-7y/2=x

4-14/2=x

10/2=x

5=x

x+y=2+5=7

it would TAKE 7 days

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