exam Maths Puzzle Numerical Ability

Why is the product of two numbers not always their least common multiple?

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exam Other Question

Subtract:

(6p - w)/(w-4) - (4c+p)/(w-4)

Find the domain of f(x)= 7+ sqrt 3x+21, and express it using interval notation.

Several values of the two functions f and g are given in the following tables:

x 4 5 6 7