Level 3
The total mass of 2 boxes and 4 crates of onions is 130 kg. Given that the mass of a box of onions is 35 of the mass of a crate of onions, what is the mass of a box of onions?
Level 3
Brenda spent $32 on some books and 47 of her original sum of money on some stationery. If Brenda had $4 left, how much money did she have at first?