book Maths Puzzle Numerical Ability

Hi, If I had a bag of marbles containing 5 green, 3 Blue and two red marbles. What is the probability of drawing the following marbles at random:

A red?
A red and then a green

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book Other Question

what is the sum of all positive rational numbers that are less than 10 and that have the denominator of 30 when written in lowest terms? morgan company recieved from lee co an invoice dated 9/27 terms were 2/10 EOM. List price on the invoice was 5,000 freight not included. Morgan recieves a 9/7 chain discount. Fr