Let the number be x 

35% of x = 227.50

35x = 22750

Therefore, x = 22750/35 = 650

Thherefore, 20% of 650 = 650 x 20/100 = 130

Av = 135 + 145 + 155 + 169 + 275 + 225/6

= 1104/6 = 184

Let the number be x 

Therefore, x² - (83)² = 8487

x² = 8487 + (83)²

x² = 8487 + 6889 = 15376

Therefore, x = 15376 = 124

Let the maximum marks be x 

Now, according to the question,

44% of x = 266 + 6% of x

44% of x - 6% of x = 266

38% of x = 266

or 38x/100 = 266

Therefore, x = 26600/38 = 700

Let the amounts of A,B and C be 8x, 9x and 7x respectively.

Therefore, 8x + 9x + 7x = 7200

or 24x = 7200

Threfore, x = 7200/24 = 300

Threfore, Amount of A = 2400

Amount of B = 2700

Amount of C = 2100

Now, adding 300 to each amount,

New ratio = 2700 : 3000 : 2400 = 9 : 10 : 8

SI obtained by Tarun

= 23000 x 13 x 9/100 = Rs 26910

Therefore, Total amount = 23000 + 26910 = 49910

Let the numbers be x, x + 2, x + 4, x + 8 and x + 10

Therefore, x + x + 2 + x + 4 + x + 6 + x + 8 + x + 10/6 = 63

Therefore, 6x + 30 = 63 x 6 = 378

Therefore, x = 378-30/6 = 58

Therefore, Q = x + 2 = 60 and S = x + 6 = 64

Therefore, Q x S = 60 x 64 = 3840

107% of cost - 92% of cost  = 75

or 15% of cost = 75

Threfore, cost = 75 x 100/15 = 500

(1st + 2nd)/2 - (2nd + 3rd)/2 = 9

1st + 2nd - 2nd - 3rd/2 = 9

Tdhrefore, 1st - 3rd = 18

Let the age of father be x and that of son be y

Therefore, xy = 640             x/y = 5/2

Therefore, 2x = 5y             Therefore, 2xy = 1280

Therefore, y2 = 1280/5 = 256

Therefore, y = 256 = 16