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The price for each package of paper of type A, including taxes, is $3 and the price for each package of paper of type B, including taxes, is $4. What is the greatest number of packages of paper a person can buy with exactly $65 ? 17 18 19 20 21 Please help me to approach this question. Thanks in advance.

I have my GRE exam coming up. ETS sent me a link with few quantitative tests. It says that these are real GRE questions. These tests have answers but no solution. Pl. help me solve the following questions: The price per pair of brand X socks is $2 and the price per pair of brand Y socks is $3. If there is no sales tax and a customer chooses only from among these two brands, what is the greatest number of pairs of socks that he can buy with exactly $25 ? 9 10 11 12 20 The price for each package of paper of type A, including taxes, is $3 and the price for each package of paper of type B, including taxes, is $4. What is the greatest number of packages of paper a person can buy with exactly $65 ? 17 18 19 20 21 Thanks in advance.