The ratio of the largest and the smallest angle of a

The average of three numbers a, b and c is 2 more than c. The average of a and b is 48. If d is 10 less than c, then the average of c and d is:

If (5x - 2y) = 170 and 4x:3y = 32:9, then find the value of (3x² + y²).

If y + 1/y = 2 then find y¹¹⁷ + 1/(y¹¹⁷)

If a = 7.250, b = 3.258 and c = 3.992 then value of a³-b³-c³-3abc is.

If  x = 19 , find x ⁵ - 20  x ⁴ + 20  x ³ - 20x ² + 20x  - 20 = ?

If 10% of 24% of x is 240, then x = ?

If a + b + c = 8, a² + b² + c² = 18 and ab + b c+ ca = 12, then what is the value of a³ + b³ +c³ –3abc?