Arithmetic Reasoning Arithmetic Reasoning - Base Level

Clearly, number of ways arranging 5 books,
= 5! = 5 × 4 × 3 × 2 × 1 = 120.
So total time taken = 120 minutes = 2 hours.

Since B and D are twins. So B = D.
Now A = B + 3 and A = C - 3.
Thus, B + 3 = C - 3 ‹=› D + 3 = C - 3 ‹=› C - D = 6.

Clearly, while counting the numbers associated to the thumb will be 1,9,17,25,.........
i.e., numbers of the form (8n + 1 ).
Since 1994 = 249 × 8 + 2, so 1993 shall correspond to the thumb and 1994 to the index finger.

Let ascent of the monkey in 1 hour = ( 30 - 20 ) = 10 feet.
So, the monkey ascends 90 feet in 9 hours i.e., 5 p.m.
Clearly, in the next 1 hour i.e., till 6 p.m.
The monkey ascends remaining 3o feet to touch the flag.

Number of cuts made to cut a roll into 10 pieces = 9.
Therefore Required number of rolls = 45 × 24 / 9 = 120.

Clearly, out of every 16 persons, there is one captain.
So, number of captains = 1200 / 16 = 75.

Since the number of carbons is 2, only two copies can be obtained.

Let x and y be the number of deer and peacocks in the zoo respectively.
Then, x + y = 80 ------------------> (i)
4x + 2y = 200 or 2x + y = 100 ---------> (ii)
Solving (i) and (ii), we get : x = 20, y = 60.

When Rahul was born,
his brother’s age = 6 years,
his father’s age = ( 6 + 32 ) = 38 years.
his mother’s age = ( 38 - 3) years = 35 years.
his sister’s age = ( 35 - 25 ) years = 10 years.

Since there are socks of only two colours, so two out of any three socks must always be of the same colour.