book Maths Puzzle Numerical Ability

the length of a rectangle is decreased by 3 feet, and the width is increased by 1 foot, forming a square region havig an area of 25 square feet. what is the area of the orginal rectangle?

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book Other Question

Populations of two villages X and Y are in the ratio of 5 : 7 respectively. If the population of
village Y increases by 25000 and the population of village X remains unchanged the respective ratio
of their populations becomes 25 :36. What is the population of village X ?
6,25,000
6,75,000
8,75,000
i need explanation
Find the future value of a deposit of $6990 at 4% compounded semiannually for 8 years. Round to the nearest cent.

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