The least number that must be subtracted from $63520$ to make the result a perfect square is

The value of $\left(\frac{0.051 \times 0.051 \times 0.051 + 0.041 \times 0.041 \times 0.041}{0.051 \times 0.051 - 0.051 \times 0.041 + 0.041 \times 0.041}\right)$ is

$6.4 - 1.6 \div 0.2 = ?$

On simplification of $\frac{(2.644)^{2}-(2.356)^{2}}{0.288},$ we get

If $a+b+c=1$ and $ab+bc+ca=\frac{1}{3}$,then $a:b:c$ is

$4 \frac{1}{2} + 3 \frac{1}{6} + x + 2 \frac{1}{3} = 13 \frac{2}{3}$