exam Maths Puzzle Numerical Ability

A log is cut into 4 pieces in 12 seconds. How long would it take to cut the same log into 5 pieces. The answer is not 15.

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i really have a big problem in understanding how equations are formed from word problems. could you please show me step by step their formation and the reasons why particular varia can you please assist me in completing the equation...instructions...business and finance.

the price of an item is given by p=2x^2-100. find the polynomial that represents the revenue generated from the sale of x items.