20x-1000 +4000 = 60x
20x-60x= -4000 +1000
-40x= -3000
x= -3000/-40
75 The mix will be 75 lbs
And $20 coffee will be 75 -50 = 25lbs
They are all multiples of 12. 12x1, 12x2, 12x6, 12x24.
Answer:
144 seconds
Step-by-step explanation:
To do solve this question, we must find the LCM (least common multiple) of 12, 16, and 18.
Let's start by prime factorizing (finding the prime factors) all the numbers.



Now, we must find the greatest quantity of each [prime] number and multiply them together to obtain the least common multiple.
Upon further evaluation of the [prime] factors, we can see that we need four 2s and two 3s. Therefore...

They will be fired together again after 144 seconds.
4 over 3.2 and 6 over 4.8
To find 10% divide by 10 so 1.07 or round to 1.08 if you like then double to
get 20% so 2.14 or 2.16 so if the bill is 10.75 you would pay 12.89 with a 20% tip