Bristol Community College, Mathematics with
Dan Avedikian, ACCUPLACER Review, Arithmetic problem 39. This is the Arithmetic ACCUPLACER
Review, Problem number 39 it says Sue studied 2 hours and 38 minutes on Monday and 1 hour
and 51 mins on Tuesday, 43 mins on Wednesday, 2 hours and 16 mins on Thursday and she did
not study on Friday. How much time did she spend studying all together during the week?
What makes this problem one that you can get wrong on the first try is when you add up
the numbers, which is pretty straight forward, you forget there is 60 mins in an hour and
you just carry the one like there is 100 mins? And that is what is going to cause the mistake.
So as long as you take your time and remember it is 60 mins in an hour, you should be fine.
So let me write Monday 2 hours and 38 mins. Tuesday 1 hour and 51 minutes. Wednesday 43
mins. Notice, 43 for the minutes, no hours. Not 43 hours. Can’t study for 43 hours in
one day. Thursday 2 hours and 16 mins, so a lot of time sitting on Thursday. And Friday
she didn’t study at all and I won’t put in a row for Friday. Let’s add up the minutes
first. So, 8 and 1 is 9. 9 and 3 is 12. 12 and 6 is 18. So here we can carry the 1. 1
and 3 is 4. 4 and 5 is 9. 9 and 4 is 13. 13 and 1 is 14. So you have 148 minutes. Now
we can add up the hours. 2 plus 1 is 3. 3 and 2 more is 5. So you have 5 hours and 148
minutes which is not any of the options we have here. Well 1 hour is 60 minutes. 2 hours
is 120 mins. 3 hours is 180 mins. I’m just multiplying out the 60. So 148 mins 2 hours
equals 120 mins. So we can take that 2 hours and put it over with the 5. 5 and 2 more is
7. And now 120 mins used up out of the 148. So there would be 28 more minutes left. So
7 hours and 28 mins and if I look at my options for possible answers, the last one, option
d is exactly 7 hours and 28 mins. So that is the answer. The answer is D. 7 hours and