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)
