[Answer] P5/6 Math Word Problems: Total Unchanged/Internet Transfer

Jason has 42 erasers and Richie has 30 erasers. After Jason gave some of his erasers to Richie, the number of game cards they have are in the ratio 1 : 2. How many erasers does Richie have in the end?

Total erasers = 42 + 30 = 72

Since number of erasers exchanged is between the same two persons, the total remains unchanged ie. 1u + 2u = 72

3u = 72

1u = 24

In the end, Richie has 2u >>> 2 x 24 = 48 erasers (Answer)