Level 3
Adam has some stickers
He gives away 13 and an additional 15 stickers away to Bryan.
He gives away 49 of the remainder less 10 stickers to Chris
and 35 of the rest to David.
Adam has 30 stickers left.
How many stickers does he have at first?
Level 1
There are 420 participants at an audition. 56 of the participants are Singaporeans. Among the Singaporeans, 190 of them are females. How many of the Singaporeans are males?
Level 3
30% of Edward's marbles is equal to 13 of Benjamin's marbles. Together, they have a total of 380 marbles. Find the number of marbles Edward has.