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CB blue book math test one

p409 question #7 (section 6)
dwayne has a newspaper route for which he collects k dollars each day. from this amount he pays out k/3 dollars per day for the cost of papers, and he saves the rest of the money. in terms of k, how many days will it take dwayne to save $1,000?
a) k/1500
b) k/1000
c) 1000/k
d) 1500/k
e) 1500k

p425 question #9 section 9
in the figure above, AD=1 and DC= radical 3. what is the value of z?

p426 question 13 section 9
Carlos delivered n packages on Monday, 4 times as many packages on tuesday as on monday, and 3 more packages on wednesday than on monday. what is the average number of packages he delivered per day over the three days?
a) 2n-3
b) 2n-1
c) 2n+1
d) 2n+3
e) 6n+1

thanx