exam Maths Puzzle Numerical Ability

I am having a problem multiplying a negative decimal number and a positive number, please help me? Thank you.

(-2.5)(20)

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exam Other Question

If a figure has dimensions of 7m x 3m and that would consist of the base what would the solid be if it has 8m high, calculate the surface area of this solid. there were 3/4 as many women as there men in a train yesterday. at the next station, 12 women and 6 men got in. as a result, there were 6/7 as many women as men on the train. how many men and women were in the train at first?