exam Maths Puzzle Numerical Ability

what is the domain of the logarithmic function f(x)= log(7-x)

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exam Other Question

One pipe can fill a tank in 8 minutes and a second pipe can fill it in 12 minutes. If the tank is empty, how long will it take both pipes to fill it?

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Please help with the following :

Name the set of sets of numbers to which the given real number belongs

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