$3149 \times 1?5 = 425115$

What is the value of $68 \%$ of two-fifths of $550\, ?$

One-fifth of a number is equal to $\frac{5}{8}$ of another number. If $35$ is added to the first number,it becomes four times the second number. The second number is

What least number must be added to $1056$ so that the sum is completely divisible by $23$?

$2^{16}-1$ is divisible by

The sum of two numbers is $22$. Five times one number is equal to $6$ times the other. The bigger of the two numbers is