In a jewelry jewels will be rejected if it is 0.05% manufacturing defect. Then how many grams they should examine to reject 2 grams of jewels?
4000
3000
2000
1500
4500
Option A Let x be the grams to examine. 0.05% of x = 2grams. 0.05 /100 X x = 2 x = 2 x 100/0.05 => x = 4000. So 4000 grams to examine to reject 2grams.
Sunil planned to deposits his money in a bank at 20% compound interest .How many years will take the deposits amount tripled?
5
6
7
8
4
Option C C.I >3P ( p- principal amt) ( tripled) => P ( 1+ r/100)n > 3P => ( 1+ r/100)n > 3 => ( 1+ 20/100)n > 3 => ( 120/100)n > 3 => ( 6/5)n > 3 When n= 7 ie) (6/5)7 > 3 ..Therefore 7 years after he will get the tripled amount.
A girl decided to read a book of 1000 pages in 20 days, reading 5hrs/day. How many days will she take to read a book of 1500 days with a rate of 2hrs/day?
50 days
75 days
65 days
70 days
60 days
Option B 1 day= 5hrs=> 20 days = 20 x 5=100hrs ie) she can read 1000 pages in 100 hrs. so for 1 hr = 1000/100 = 10 pages she can complete. Then 2 hrs , 20 pages she can complete. Per day 20 pages , then for 1500 pages = 1500/20 = 75 days to complete.
27.92% of 425.02-24.03% of 299.97= (?)
Option Substituting (?) with “x” x=28%×425-24%×300 x =119 – 72 x=47
If 5 years before the ratio of ages of daughter and father is 3 : 15. After 5 years from now the ratio will become 8: 20. Then Find out the age of the father?
25 years
40 years
35 years
45 years
30 years
Option C Let the age of daughter before 5 years= 3x Let the age of father before 5 years = 15x Then , (3x + 10/15x+10) = 8/20 =>x=2 So age of father before 5 years= 15x= 15*2 = 30 years present age = 30+ 5= 35 years
Seetha scored 60 % of marks in Hindi, 70% marks in Science and ” M” marks in Maths.If Maximum marks of each subject is 150 and he scored 70% marks. Then find the marks he scored in Maths?
110
120
130
125
135
Option B Marks in Hindi = 60/100 * 150 = 90 Marks in Science = 70/100 * 150 = 105 Total marks in 3 subjects = 70/100 * 450 =315 so 90 + 105 +M = 315 => M= 120
Raju bought a LED T.V and got diwali discount 10% on marked price. The showroom got 4% profit .If Raju paid Rs. 40,000, then find the marked price of the T.V?
Rs.45,000
Rs.42,006
Rs.46,000
Rs.46,222
Rs.43,000
Option D selling price= 104/ 100 * 40, 000 = Rs. 41,600 Let the marked price be x. So,90 % of x = Rs.41,600 So 100 % of x= (41,600/ 90) * 100 =Rs.46,222
From a group of 6 soldiers and 4 police a committee of 5 people is formed for emergency rescue operation. The committee is to be formed having atleat 3 soldiers.Find the number of possible ways?
A circular frame is inserted in a square frame of area 16 metre square. So what is the area of the part of square frame outside the circle?
2.45
4.56
3.43
5.89
1.25
Option C Let the side of the square frame = a meter area = a 2 = 16 => a= 4 m =>diameter of a circular frame = 4m => radius= 2m area = 22/ 7 * 2 * 2 =12.57 So remaing outer area= 16- 12.57=3.43m 2
Inlet pipe 1 is 6 times more efficient than inlet pipe 2 to fill the tank.If inlet pipe 1 can fill the tank in 32 min, then how much time is taken by both pipes to fill the tank when both the pipes are opened?
24 min
36min
20min
16 min
28 min
Option E Let efficiency of pipe 1= 7x efficiency of pipe 2= x Let both the pipes together can fill the tank in t min =>7x * 32 = ( 7x+ x) t =>t = 28 min
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