book Maths Puzzle Numerical Ability

Joe can finish a math test in 20 minutes less than Phyllis. If they work together on the test they can finish it in 30 minutes. How long would it take each one to finish it alone

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book Other Question

Simply: (2 -3x)^2 I need to really understand how they came up with the answer to this one, I have my final tomorrwo. Th e other problem is find the y intercept for 2x - 3y =6. Thank you so very much for any help. Thank you Thank you. If the accounts payable department of XYZ company writes a check for $2303 to pay an invoice from WestCo, Inc. How much was the invoice total if the check written for $2303 includ