Question

2. 7 men and 8 boys can do a piece of work in
2 days. 4 men and 12 boys can do of the
same work in 1 day. In how many days will
1 man do this work?

Answer 1

Answer:

Step-by-step explanation:

men => x & boys => y

ATQ,

7/x + 8/y = 1/2

4/x + 12/y = 1/1

Let 1/x = a & 1/y = b

7a + 8b = 1/2

4a + 12b = 1/1

14a + 16b = 1

4a + 12b = 1

56a + 64b = 4

56a +168b = 14

-       -            -

_________________

- 104b = -10

b = 10/104 = 5/ 52

1/y = 10/104

y = 104/10 = 10.4

solve for x. i ran out of time sorry. :(