exam Maths Puzzle Numerical Ability

4z^2=9

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exam Other Question

What annual payment will discharge a debt of Rs. 440 due in 5 years at simple interest reckoned at 5 %

X = 100 * P * (Y) / 100 T + { RT ( T � 1 ) /2}

X = 100 * 440 * (1) / Variables on Both Sides

Please show me the steps. The answer is a -3

4a-8=9a+7
a=______

Thank you very much!