Bleejones00
12.09.2021 •
Mathematics
Stoplight A changes color every 45 seconds and Stoplight B changes color every 80 seconds. Both stoplights changed color 60 seconds ago. After how many seconds will the stoplights change color at the same time again.
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Ответ:
9514 1404 393
660 seconds
Step-by-step explanation:
The least common multiple of 45 seconds and 80 seconds is ...
45×80/GCF(45,80) = 45×80/5 = 720
The next change will be 720 seconds after the last one, so 720 -60 = 660 seconds from now.
Additional comment
You can find the least common multiple by looking at the factors of 45 and 80:
45 = 5×980 = 5×16The LCM will include one copy of the common factor and all of the unique factors:
LCM(45, 80) = 5×9×16 = 720
You can see that the greatest common factor is 5, and that the LCM is the product (5×9)(5×16) divided by 5:
LCM(a, b) = a×b/GCF(a, b)
Ответ:
$29
Step-by-step explanation:
A PS5 costs $500. Subtract 500 from the total cost:
645 - 500 = 145
There are 5 games in total, costing $145 in all. Assuming all of them have the same price, simply divide 145 with 5:
145/5 = 29
Each game costs $29.
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