If $2994 \div 14.5 = 172$,then $29.94 \div 1.45 = ?$

Simplify: $1-[2-\{5-(4-3-2)\}]$

$7^{5} \div 7^{3} \div 7^{2} \times 7^{4} \times \frac{1}{7^{3}} = 7^{?}$

If a man spends $\frac{5}{6}$ part of his money and,again earns $\frac{1}{2}$ part of the remaining money,what part of his money is with him now?

The value of $\frac{2.75 \times 2.75 \times 2.75 - 2.25 \times 2.25 \times 2.25}{2.75 \times 2.75 + 2.75 \times 2.25 + 2.25 \times 2.25}$ is:

In a pair of fractions,fraction $A$ is twice the fraction $B$ and the product of the two fractions is $\frac{2}{25}.$ What is the value of fraction $A$?