book Maths Puzzle Numerical Ability

a box contains red and green pencils only. a child randomly selects one pencil from the box. if p(red) = 3/5,
then p (green) =?

i got 2/5

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book Other Question

Find 4 consecutive integers such that the product of the first and second integers minus 2 is equal to 3 times the product of the third and fourth integers. If Tom invests 6500.00 at 4% per year, how much additional money must he invest at 10% to ensure that the interst he recieves each year is 8% of the total invested.