From the given equation,

88x370/100 + 24x210/100 - 118 = x

=> x = 325.6 + 50.4 - 118

x = 258.

The given series follows the pattern that,

×5+5,   ×5+5,   ×5+5,   ×5+5,   ×5+5

38 x 5 + 5  = 195

195 x 5 + 5 = 980

980 x 5 + 5 = 4905

4905 x 5 + 5 = 24530

24530 x 5 + 5 = 122655

So the missing number is 980 .

Let the age of Manisha and Sudeshna is 5x and 6x years respectively.

According to the given data,

5x+8/6x+8 = 7/8

42x + 56 = 40x + 64

x = 4

Required Difference of their ages = (6 × 4)  –  (5 × 4)

= 4 years.

Let Ramana's age 8 years ago be x years and mother's age 8 years ago be 5x

2(x + 16) = 5x + 16

2x + 32 = 5x + 16

3x = 16 

  years

Hence, Present age of Ramana =  years

1,6,8 are figures composed of straight as well as curved lines

3,7,9 are closed figures shaded by oblique line segments

2,4,5 are figures composed of straight lines only.

1,5,7 contain a rectangle with its two diagonals as the outer element and another element (similar or different) placed inside it.

2,6,9 contain a triangle with its three medians as the outer element and another element (similar or different) placed inside it.

3,4,8 contain a circle with its two mutually perpendicular diameters as the outer element and another element (similar or different) placed inside it.