$38 \%$ of $? = 3596 - 632$

The sum of seven numbers is $235$. The average of the first three is $23$ and that of the last three is $42$. The fourth number is

The sum of the digits of a two-digit number is $8$. If the digits are reversed,the number is increased by $54$. Find the number.

The expression $\frac{8.25 \times 8.25 + 6.75 \times 6.75 - 2 \times 8.25 \times 6.75}{8.25 \times 8.25 - 6.75 \times 6.75}$ when simplified equals:

Find the missing digit in the expression: $60 ? 6 \times 111 = 666666$.

$1 \frac{1}{3} - 1 \frac{1}{9} + 1 \frac{1}{6} = ?$