exam Maths Puzzle Numerical Ability

Please help me solve this equation: a playground is 25m x 40m. it is surrounded by a paved skating path of uniform width. the area of the playground and path is 1,426 square meters

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exam Other Question

What is the value of log 1000 + 2log3 9-log5 125? Where 3 and 5 are the base perspectively. Bob invested $20,000, part at 14% and part at 13%. If the total interest at the end of the year is $2,720, how much did he invest at 14%?
A). $11,000

B). $12,000

C). $8,000

D). $13,000