- 5, 8, 12, 18, 27, ?
5060407020Option C

Difference of difference

? = 40 - 142, 133, 115, 88, ?
5244603876Option A

-9,-18,-27,-36

? = 52 - 2, 10, 30, 68, 130, ?
200150165188222Option E

Difference of difference

? = 222 - 3, 8, 18, 38, 78, ?

161158170153165Option B

+5,+10,+20,+40,+80

? = 158 - 6, 3, 3, 6, 24,?
184177164192189Option D

*0.5,*1,*2,*4,*8

? = 192 - A boat goes 30 km downstream and 18 km upstream in 6 hours, again it goes 40 downstream and 20 km upstream in 22/3 hours. Find speed of boat.
107896Option C

Let speed of boat = u kmph And speed of flow = v kmph

According to question 18/( u â€“ v) + 30/( u + v) = 6 â€¦ . (i)

20/( u â€“ v) + 40/( u + v) = 22/ 3 â€¦ (ii)

On solving the equation We get u = 8 kmph, v = 2 kmph - A vessel contains mixture of milk and water in which water concentration is 30%. If 20% water and 30% milk is taken out and replaced with equal quantity of water, then quantity of water increases by what percent of the initial quantity of water in the mixture.

60%40%50%70%80%Option D

Required % = [30/100 Ã— 70]/30 Ã— 100 = 21/30 Ã— 100 = 70% - The ratio of income of A, B and C is 3 : 7 : 4 and the ratio of their expenditure is 4 : 3 : 5 respectively. If A saves Rs 300 out of Rs 2400, find the savings of C.

500444525480625Option C

Salary of A = 3x = Rs 2400

Salary of B = 7x = Rs 5600

Salary of C = 4x = Rs 3200

Expenditure of A, B and C = 4y, 3y & 5y respectively.

Saving of A is 300 Expenditure = 4y = (2400 â€“ 300) = 2100

y = 2100/4 = 525 - A, B and C can finish a work in 10, 12 and 15 days respectively. They start working together. If B stops after 2 days, how long would it take A and C to finish the remaining work?
24536Option D

A + B + C in 2 days, do 2 ( 1/10 + 1/ 12 + 1/ 15) = 1/2 work

Now, B withdraws, A + C will do the whole work in (10Ã—15)/( 15+10) = 6 days

It will take 6/2 i.e. 3 more days

The marked price of a radio is Rs 480. The shopkeeper allows a discount of 10% and still gains 8%. If no discount is allowed, find his gain percent.

30%20%50%40%60%Option B

M. P. = Rs 480/-

Discount = 10%

S.P. = 90/100 Ã— 480 = Rs. 432

P% = 8% C.P. = 100/108 Ã— 432 = 400

If no discount is given then S.P. = M.P. i.e. S.P. = 480 ?

P% = S. P. âˆ’C. P. /C. P. Ã— 100

480 â€“ 400/400 Ã— 100 = 80/400 Ã— 100 = 20%