2023 AMC 10B Problems/Problem 1

Problem

Mrs. Jones is pouring orange juice into four identical glasses for her four sons. She fills the first three glasses completely but runs out of juice when the fourth glass is only full. What fraction of a glass must Mrs. Jones pour from each of the first three glasses into the fourth glass so that all four glasses will have the same amount of juice?

Solution 1

We let denote how much juice we take from each of the first children and give to the th child.

We can write the following equation: , since each value represents how much juice each child (equally) has in the end. (Each of the first three children now have juice, and hte fourth child has more juice on top of their initial .)

Solving, we see that

~Technodoggo

Solution 2

We begin by assigning a variable to the capacity of one full glass. Quickly we see the four glasses have full glasses filled. In order for all four glasses to have the same amount of orange juice, they have to each have . This means each of the three full glasses must contribute of the of the amount they have to the fourth glass.

~vsinghminhas

Vide Solution 1 by SpreadTheMathLove

https://www.youtube.com/watch?v=SUnhwbA5_So