book Maths Puzzle Numerical Ability

How do you change 28/9 to a mixed or whole number.

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book Other Question

Solve for X

2+9x= -5x -18
Could you help me solve this problem?

The interest rate on an auto loan in May was 12 3/8%. By September the rate was up to 14 1/4%. How many percentage points did the interest rate increase over the period?

Thanks!