Question

A doctor sees each of her patients for 15 minutes. How many patients can she see in 4-1/2 hours?
18
19
20
30
none
14
Michi put $7.50 worth of gas in her car. Two co-workers who were riding to work with her offered to share the cost of the gas. One paid 1/2 of the total amount and the other paid 1/3 of the total amount. How much of the total amount was left for Michi to pay?
$1.25
$2.25
$5.25
$6.25
none
15
A bookshelf is 4-3/4 feet wide. How many 3-inch-wide books will fit on the shelf?
14-1/4
17
18
19
none
16
It takes a woman 12 minutes to drive one way to work. She goes home for lunch 3 days each week. How much time does she spend driving to and from work each 5-day work week?
2 hours, 36 minutes
3 hours
3 hours, 12 minutes
3 hours, 20 minutes
none
17
A business buys invoice forms at a cost of $4.45 a box for the first 20 boxes, $4.00 a box for the next 25 boxes, and $3.75 a box for any additional boxes. How many boxes of invoice forms can be bought for $234.00?
47
57
67
81
none
18
A student returned 4 overdue books to the library. The fine for each overdue book is $0.35 for the first day, $0.40 for each of the next 3 days, and $0.45 for each day after that. The total fine was $13.40. How many days overdue were the books?
6
8
18
20
none

Answer 1

1) Doctor (15 min per patient). 4.5 hr = 270 min. 270/15 = 18 patients. Answer: 18.

2) Michi: coworkers pay 1/2 + 1/3 = 5/6, left = 1/6 of $7.50 = $1.25. Answer: $1.25.

3) Shelf 4 3/4 ft = 4.75×12 = 57 in. 57/3 = 19 books. Answer: 19.

4) Commute: one way = 12 min. Each normal day = 24 min. On 3 lunch days she makes 2 extra one-way trips (24 min) each, so extra = 72 min. Total = 5×24 + 72 = 192 min = 3 hr 12 min. Answer: 3 hours, 12 minutes.

5) Boxes: first 20 cost 20×4.45 = $89. Next 25 cost $100, remaining $45 buys 45/3.75 = 12 more. Total = 20+25+12 = 57 boxes. Answer: 57.

6) Fine: total per book = 13.40/4 = $3.35. For d≥5 per-book fine = 1.55 + 0.45(d−4) = 0.45d − 0.25. Set 0.45d − 0.25 = 3.35 → d = 8. Answer: 8 days.