Level 3
2700 stickers are in 3 packets.
The 1st packet has 300 stickers more than the total number of stickers in the 2nd and 3rd packets.
The 3rd packet has 2 times as many stickers as the 2nd packet.
How many stickers does the 1st packet contain?
Level 3
Adam pays $1600 for a TV set, a mobile phone and a computer.
The TV set costs 3 times as much as the computer.
The mobile phone costs $500 less than the TV set.
How much is the mobile phone?