exam Maths Puzzle Numerical Ability

Can someone help me on this?
I need to find the LCM for 4 and 20. (Least common multiples)

Thanks,
Ashley

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how many milileters of a 20% acis solution must be mixed with 30ml of an 80% acid solution to make a 32% acid solution? i have to show a chart and fill it out hello, i need some help to simplify and reduce to lowest terms

1/(x+5y)-5/(x-5y)+3/(x^2-25y^2)