Medicines have become an element of surprise and a cause

If 2x + y = 10 and 3x - 2y = 5, find the value of x + y.

If a³ + b³ = 6240 and a + b = 30, then find the value of {(a + b)² – 3ab}

If p = 34 - q - r and pq + r(q + p) = 289, then find the value of (p² + q² + r²).

If the ratio of the areas of two triangles is 4:3 and the ratio of their heights is 3:4, then the ratio of the lengths of their bases will be

If x = (2+√3)/(2-√3), y = (2-√3)/(2+√3). Then find out the value of (x²+y²-xy)/(x²+y²+xy)?

If a + b + c = 6, a³ + b³ + c³-3abc = 342, then what is the value of ab + bc + ca