book Maths Puzzle Numerical Ability

please help i really don't get this...i've tried to figure it out but i don't know where to start.
Complete the sequence: 19, 5, 17, 21, 5, 14, 3, ____. Explain your answer.

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book Other Question

triplin the greater of two consecutive even integers gives the same result as subtracting 10 fom the lesser even integer. what are th integers? Could you help me solve the following 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 interst rate increase over the period?