exam Maths Puzzle Numerical Ability

In the coordinates (5,-4) which number represents the y value? The answer to this is -4. The next question is "What are the coordinates of the origin?"

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A number decreased by 23 is equal to 214. Find the number. How would i figure this problem out? Thanks 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) /