exam Maths Puzzle Numerical Ability

Collin purchased an extension ladder consisting of two 7-foot sections. When full extended, the ladder measure 11 feet 9 inches. By how much do the two ladder sections overlap?

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a^-2 - b^-2 divided by ab^-4 - ba^-4 all raised to the neg 5 exponent How many gallons of a 60% antifreeze solution must be mixed with 100 gallons of 15% antifreeze to get a mixture that is 50% antifreeze?