3 years ago

A machine can grade 30 tests in 2 minutes. At this rate, how long will it take the machine to grade 135 tests?

Mathematics

2 answers:

Nonamiya [84]3 years ago

8 0

Answer:

9 minutes

Step-by-step explanation:

(2 min(60 s/min)) / 30 test = 4 s/test

135 test(4 s/test) = 540 s

540s / 60 s/min = 9 min

Sav [38]3 years ago

6 0

ANSWER: 9 minutes

WHY:

30/2= 15 so 15 tests per minute

135/15=9 so nine minutes for 135 tests

MARK ME BRAINLIEST PLEASE

You might be interested in

A copy machine makes 24 copies per minute. How many copies does it make in 5 minutes and 15 seconds?

liubo4ka [24]

Answer: it makes 126 copies

Explanation:

15/60=6/24

5x24=120

6+120= 126

8 0

2 years ago

Two containers, A and B begin with equal volumes of liquid.

Reika [66]

Answer:

volume left in A is 80ml

Step-by-step explanation:

let original volume in both be x ml

after pouring from A to B

vol in A = x - 120

vol in B = x + 120

now it is given that

vol in B = 4 times vol in A

implies

$x + 120 = 4 \times (x - 120) \\ x + 120 = 4x - 480 \\ 3x = 600 \\ x = 200$

hence original volume in A is 200ml. after pouring in B it is 200-120 = 80 ml

8 0

3 years ago

Write the standard form of the equation of the line through (4, 4) and parallel to y = -6x + 5.

valina [46]

Answer:

−

Step-by-step explanation:

5 0

3 years ago

Boots: $59.00, discount: 10 percent sales tax 5.5 percent

I am Lyosha [343]

Answer:

Total cost of boots = $56.02

Step-by-step explanation:

$59 x 0.90 = $53.10

$53.10 x 1.055 = $56.02

59 x 0.10 = 5.9

59 - 5.9 = $53.10

53.10 x 0.055 = $2.92 tax

$53.10 + $2.92 = $56.02

8 0

3 years ago

Heather made a total of $451.78 last month at her part-time job. If she worked 14 hours, how much did she make per hour?

Step2247 [10]

The amount of money divided by the amount of hours will give you how much money she makes per hour.

451.78/14=32.27.

She earned $32.27 per hour.

3 0

3 years ago