Answer: 57
Step-by-step explanation:
I think the answer is A. You put in most of your 40 hours through the week so that you have your weekends free. Usually, you will spend 8 hours a day, 5 times a week for studying so that you can spend your weekend to work, play, family or any other activities that do not involve studying. Also, this may avoid procrastination for some students.
Let x be number of downloads of standard version and y be number of downloads of high quality versions.
The hight quality downloads are twice as the standar downloads. So,

The downloaded data for x standard version is 2.7x and for y high quality version is 4.2y. The total downloaded data is 3219. So,

Substitute 2x for y in the equation and solve the obtained equation for x.

So value of x is 290. Thus downloads of the standard version were 290.
Answer: 290
It's not an arithmetic sequence.
Answer:
20 : 43
Step-by-step explanation:
width : length
40 mm : 86 mm
40 : 86
20 : 43