View the Question Missing Number
58
The number in the center is the sum of the products of the numbers above and below it.
So,
6 * 7 + 3 * 9 = 42 + 27 = 69
3 * 6 + 8 * 4 = 18 + 32 = 50
5 * 8 + 2 * 9 = 40 + 18 = 58
Tuesday, 18 August 2015
Sunday, 26 July 2015
Age Problems - Answer
View the Question Age Problems
Answer (1)
39 yearsThen, x = 3y
And, x + 13 = 2 (y + 13)
Solving them, we get 3y + 13 = 2y + 26
or y = 13
So the persons age = 3y = 39
Answer (2)
34 years
Two years ago,
x - 2 = 4 (y - 2)
x - 2 = 4y - 8
x = 4y - 6
Two years from now,
x + 2 = 3 (y + 2)
x + 2 = 3y + 6
x = 3y + 4
So, 4y - 6 = 3y + 4
i.e. y = 10
x = 4y -6 = 40 - 6 = 34
Answer (3)
Their ages are 15 years, 17 years and 45 years.Let the ages of youngest son, older son and the father be x, y and z respectively.
Then,
x + y =32
y + 28 = 3x = z
which gives,
x - 28 = 32 - 3x
4x = 60
x = 15 years
y = 17 years
z = 45 years
Number Series 2 - Answer
View the Question on Number Series
13, 16, 49, 169, ___
16 = (1+3)2,
49 = (1+6)2,
169 = (4+9)2,
So the next term = (1+6+9)2 = 162 = 256
16 = (1+3)2,
49 = (1+6)2,
169 = (4+9)2,
So the next term = (1+6+9)2 = 162 = 256
Speed and Time 1 - Answer
View the Question Speed and Time 1
5 kms/hr
Let the speed of boat be x and speed of river be y.Speed upstream = x - y
Speed downstream = x + y
Also x - y +5 = x + y.
So y = 2.5 kms/hr
and 3(x - y) = x + y
-> 3x - 3y = x + y
-> 2x = 4y
-> x= 2y = 5kms/hr
Saturday, 25 July 2015
Students in a Row - Answer
View the Question Students in a Row
It can be seen as:
10 students - Rohan - 10 students - Anuj - 8 students
Total students = 30
Collision of Trains - Answer
View the question Collision of Trains
Since the distance of trains from each other is 200 km, and their relative speed is 120 + 80 = 200km/hr, therefore, the trains will collide in 1hr. This means that the bug also flies for 1 hr at an speed of 160hm/hr, and covers a distance of 160kms.
Number Series - Answer
View the Question on Number Series
Answer (i)
0, 2, 24, 324, ____
0 = 01 x 1,
2 = 12 x 2,
24 = 23 x 3,
324 = 34 x 4,
So the next term = 45 x 5 = 5120
Answer (ii)
1, 8, 9, 64, 25, 216, ____
This is a mixture of 2 series.
12 = 1,
23 = 8
32 = 9,
43 = 64,
52= 25,
63 = 216,
So the next term = 72 = 49
0, 2, 24, 324, ____
0 = 01 x 1,
2 = 12 x 2,
24 = 23 x 3,
324 = 34 x 4,
So the next term = 45 x 5 = 5120
Answer (ii)
1, 8, 9, 64, 25, 216, ____
This is a mixture of 2 series.
12 = 1,
23 = 8
32 = 9,
43 = 64,
52= 25,
63 = 216,
So the next term = 72 = 49
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