4 men or 8 women can do a work in 15 days, then in how many days 6 men and 12 women can complete the whole work ?

4 days

3 days

5 days

6 days

8 days

Option C Efficiency ratio of men and women = 2 : 1 total work = 4 * 2 * 15 = 120 days required = 120/ 6 * 2 + 12 * 1 = 5 days

If simple interest earned on a certain sum of money at certain rate of interest after 5 years is 2/7 times the amount earned on the same sum of money after 5 years, then what is the rate interest ?

10%

6%

12%

8%

15%

Option D Let amount = 7x SI = 2x P = 7x – 2x = 5x rate of interest = 2x * 100/5x * 5 = 8%

Average of 12 numbers is 60. If average of first six and last four numbers is 70 and 50 respectively and ratio of seventh and eighth number is 3 : 2, then find the 8th number ?

50

40

80

70

75

Option B Total 12 numbers = 12 * 60 = 720 total of first six numbers = 70 * 6 = 420 total of last four numbers = 50 * 4 = 200 8th number = (720 – 420 + 200) 2/5 = 100 * 2/5 = 40

Sanjay saves 25% of his monthly income. If his monthly expenditure is increased by 40% while his monthly savings remain same, then find the percentage increase in his monthly income ?

36%

40%

28%

30%

40%

Option D Let income of Sanjay = 100x savings = 100x * 25/100 = 25x expenditure = 100x – 25x = 75x increased expenditure = 75x * 140/100 = 105x income = 105x + 25x = 130x % increased income = 130x – 100x/100 * 100 = 30%

490 ml of mixture contains milk and water in the ratio of 4 : 3 respectively. If 140 ml of mixture is taken out and 50 ml of water is added, then what is the ratio of milk to water in final mixture ?

2 : 3

4 : 5

3 : 2

1 : 1

2 : 5

Option D Quantity of milk = 490 * 4/7 = 280 quantity of water = 490 * 3/7 = 210 140 ml of mixture is taken out, (280 – 140 * 4/7)/(210 – 140 * 3/7 + 50) = 200/200 = 1 : 1

Directions : What will come in place of questions marks (?) in the following given number series ? 30, 62, 126, 254, 510, ?

920

1022

648

840

1220

Option B The series is (*2 + 2), (*2 + 2), (*2 + 2)…

?, 9, 25, 61, 125, 225

5

4

6

8

2

Option A The series is (+2^2), (+4^2), (+6^2), (+8^2), (+10^2)

35, 42, 56, 77, ?, 140

135

140

130

105

112

Option D The series is (+7), (+14), (+21), (+28), (+35)

8, 16, 48, 192, 960, ?

4820

5760

1920

3200

9600

Option B The series is (*2), (*3), (*4), (*5), (*6)