book Maths Puzzle Numerical Ability

Simplify (3x^2y^3)(2x^3y)

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book Other Question

the sum of two numbers is 4, and their difference is 24. find the numbers. I have 6 digits. My hundred thousands digit is 1 less then my ones digit, 8 more than my thousands digit, twice my tens digit, and 4 times my hundreds digit. What number am I? E