Question

a student can eat 4.0 M&Ms every 1.00 seconds. If an M&M has a mass of 63g, determine how many kilograms of M&Ms can be eaten by a class of 20 students in 3.75 hours.

Answer 1

To be able to determine the right answer to this item, we simply have to use the proper conversion factors and dimensional analysis.

First, we calculate for the total number of M&M that the 20 students can eat in 1 second considering that each student can eat 4.
n = (20 students)( 4 M&Ms / student )
n = 80 M&M

Then, we calculate for the mass of 80 M&M given that each weighs 63 g.
mass = (80 M&M)(63 g/ 1 M&M) = 5040 g of M&M

Next, we solve for the total mas of M&M that can be eaten in 3.75 hours considering that one hour is equivalent to 3600 seconds.
total mass = (5040 g M&M/s)(3600 s/1 h)(3.75)
total mass = 68040000 g of M&M

Converting this to kilogram by dividing it by 1000 will give us an answer of,
total mass = 68040 kg of M&M