If $${a+b=10}$$ and $$ \sqrt{a\over b}-13=-\sqrt{b\over a}-11$$, then what is the value of $${3ab+4a^2+5b^2}$$?

What is the value of $$ {0.55 × 4.5\over 0.81}$$ ?

Evaluate: $${-(4-6)^2-3(-2)+।-6।\over 18-9÷3×5}$$

25.6% of 250 +√ ? = 119

Solve: 12–[26–{2+5×(6–3)}]

If $$ {(x-2)^{2}+(y-{1\over2})^{2}}=0$$, then the value of $$ {x\over y}$$ is

  $$25\% \ of (50\% \ of \ 30\% \ of \ 150)\over 40\% of \ 2250$$ is equal to:

When x = 1, then value of |2x – 1| + |x – 3| will be -