GATE Numerical Reasoning Aptitude (Analytical) Questions - 2

Middle number is the average of the numbers on both sides.(Left and Right)
Average of 6 and 4 is 5
Average of (7 + 4) and (2 + 1) is 7
Average of (1 + 9 + 2) and (1 + 2 + 1) is 8
Average of (4 + 1) and (2 + 3) is 5
Therefore, Average of (3) and (3) is 3

The number appearing in the centre line is average of the sum of numbers appearing on left  and right of numbers.

Hence, the unknown number is given by 3 + 3 / 2 = 3

Take square on both side, we get

9 inches = 0.25 yards

Why not option (A) ?

Let me give you an example

(3m)²=9m²

It means that if number gets squared then the units also get squared. Above is an example of a square having side 3m, the area of this square would be 9m².

Similarly,

(9 m)^½ = 3 m^½

Hence, if I have

(9 inches)^½ = (0.25 yards)^½

If I take the square root, then we get

3 inches^½ = 0.5 yards^½

and not 3 inches = 0.5 yards

So option (A) is wrong

So the adjoining figure for solution

18² = 324
21² = 441
8² = 64
X² ! =  97
All the above are perfect squares but 97 is a prime number.

The total area of the triangle which is bounded by the 2 given lines in the first quadrant

= 1/2 x 14/3 x 7

=  98 / 6

= 16.33 sq units

And area bounded with x axis and the lines in the 1st quadrant   

= 1/2 x ( 4.67 - 2.5)

= 1.08 sq units

So area bounded with y axis  =  total area in 1st quadrant - area in 1st quadrant bounded by the lines and the   x axis

= 16.33 - 1.08      

= 15.25 sq units

The equation of a line is
y = mx + c where m is the slope & c is the y-intercept
Now, In this question x is replaced with lnx
So, the equation of line becomes,
y = mlnx + c
or, y = -0.02lnx + c
We have given with abscissa which is essentially x-intercept. So, now we have to find ‘c’ the y-intercept.
for, y=0, lnx = 0.1 (given in the question)
Putting the value,
0 = -0.02 × 0.1 + c
or, c = 0.002
So, the equation of line becomes,
y = -0.02lnx + 0.002
putting x = 5 (asked in the question)
y = -0.002ln5 + 0.002 = -0.002 × 1.6 + 0.002 = -0.03
(ln5 = 1.6)

Total number of cubes = 9 × 3 = 27
∴Total number of faces = 27 × 6 = 162
∴Total number of non-visible faces = 162 - 54 = 108

∴ Number of visible faces / Number of non visible faces = 54/108 = 1/2

Present time is given  by

= 10: 30 + 2 : 15

= 12 : 45

Let’s assume that the piece from which rectangle is made, has length x mm.

Perimeter of rectangle = x

∴ Breadth of rectangle = x/6 and length of rectangle = 2x/6 = x/3

⇒ Area of rectangle = x/6 × x/3 = x²/18

Perimeter of square = 340 – x

Length of square = (340 – x)/4 = 85 – x/4

⇒ Area of square =(85 − x/4)²

Total area =(85 − x/4)² + x²/18 = f(x)

Now, f′(x)=2×(85 − x/4)× − 1 + 2x/18 = 0

Solving, we get: x = 180

Length of square = 85 – x/4 = 85 – 45 = 40 mm

Speed = length / time

⇒ length = speed x time

120 = 10 x s₁ ⇒ s₁ = 12

150 = 15 x s₂ ⇒ s₂ = 10

|s₁ - s₂| = 2