exam Maths Puzzle Numerical Ability

how step by step I can simplify this example

(2a)(5a)(6a)

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exam Other Question

Write the algebraic expression that coresponds to five times the difference of a number and 12.________________. a rational number has a decimal which either terminates or repeats endlessly,
while an irrational number has a decimal which continues endlessly and without repeating. is this true or false?