Level 3
Adam has 130 stickers.
Adam has 10 more blue stickers than red ones.
Adam has 20 more yellow stickers than blue ones.
Find the number of red stickers.
Level 3
2700 stickers are in 3 packets.
The 1st packet has 3 times as many stickers as the 2nd packet.
The 3rd packet has 2 times as many stickers as the 2nd packet.
How many less stickers are there in the 2nd packet than the 3rd packet and 1st packet?
Level 3
Adam has 140 stickers.
Adam has 10 more blue stickers than red ones.
Adam has 20 more red stickers than yellow ones.
Find the number of blue stickers.