The answer is 6x. You divide 42 by 7. Take out the x. 42 divided by 7 will equal 6.
The partial products that Lucas would need to solve this problem would be 3,740 and 187,000 if you are multiplying 374 on the top column and 510 on the bottom column. Or, the partial products Lucas would need is 2,040 and 35,700 and 153,000. Both partial products combination added together would be 190,740.
2 1/2 is also 2.5, therefore to calculate each liter, just 60/2.5, so the answer is $24
10.25 hours on average
8+12+12+9=41
41/4= 10.25