Question

A herd of monkeys gathered in the morning at 8 O clock. After that in every 2 hours 5 monkeys went out and 10 monkeys came in. At 4 O'clock afternoon number of monkeys became 50. How many monkeys were in the herd at 8 o'clock in the morning. 20 25 40 30
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Answer 1

Answer:

30 monkeys

Step-by-step explanation:

At 8 o clock there were X mokeys

At 10 o clock = (X -5 + 10) = (X+5)

At 12 o clock = (X + 5) -5 + 10 = (X+10)

At 2 o clock = (X + 10) - 5 + 10 = (X+15)

At 4 o clock = (X + 15) - 5 + 10 = X + 20

X + 20 = 50

so X = 50 - 20 = 30 Monkeys

Answer 2

Answer:

30 Monkeys

Step-by-step explanation:

8 A.M. = x

10 A.M. = (x -5 + 10) = (X+5)

12 P.M. = (x + 5) (-5) + 10 = (X+10)

02 P.M. = (x + 10) (- 5) + 10 = (X+15)

04 P.M. = (x + 15) (- 5) + 10 = X + 20

             → x + 20 = 50

                 x = 50 - 20 = 30