Question

5 cows or 15 horses can graze a grass field in 8 days . In how many days 8 cows and 11 horses will graze twice of this grass field ?

Answer 1

5 cows or 15 horse can grade a grass field in 8 Days.

5 cows = 15 horse
1 cow = 5 horse

15 horse --> 8 days

= 8 cows and 11 horse
or, 40 horse & 11 horse
or, 51 horse -------> x days

15×8 = 51×x
x = 120/51
x = 2.35 Days
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Hence it takes 2.35 days for 8 cows and 11 horses to graze same area.
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Number of days required to graze the area twice of this

=2× 2.35

= 4.7 Days (approx)
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Answer 2

5 cow =15 horses
1 cow =3 horses

now ,8 cow =3×8=24 horse
8 cow + 11 horse =24 +11
 ⇒8 cow + 11 horse=35 horse

15 horse graze the fied in  8 day
1 horses graze  the field in (15×8) day

35 horse  graze the same field in = 15×8/35=24/7    day

         If field is twice=24×2/7= 48/7 days

Answer =48/7 days 
 I hope its help you '
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