Book Maths Puzzle Numerical Ability

find the smallest number n such that n! is divisible by 990

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Book Other Question

what is the last digit of the expression 4x9^2x4^3x9^4x4^5x9^6x...........x4^99x9^100 ? a pipe can fill the tank in x hours and other can empty in y hours.if the tank is 1/3 rd full then the number of hours n which they will together fill it in is