Adults can burn 210 calories per hour riding a
bike. If your bike ride was
21 hours, how many
calories would 8 adults
burn?

210 x 21 = 4410 calories burned for 1 adult

4410 x 8 = 35280 calories burned for 8 adults

Step-by-step explanation:

First you figure out how much calories are burned total for 1 adult on a 21 hour bike ride with the information that you know of how much adults burn.

Next you multiply your answer by 8 to figure out the total of calories burned for all 8.

Step-by-step explanation:

35280 calories would be burnt.

I think it will help you.

210×21=4410

Now,

4410×8= 35280.

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.