Level 3
Peter folded 38 paper aeroplanes on the first day. Each day he did 4 more paper aeroplanes than the previous day. On the last day, he made 74 areoplanes. How many days did he fold paper arfour days. Each day after the first day, he made 6 more paper aeroplanes than the day before. How many days did he fold paper areoplanes?
Level 2
A bag of marbles weighs 45 kg.
A bag of beads weighs 110 kg less than the bag of marbles.
Find the total mass of the bag of marbles and the bag of beads.
Level 3
A marble, a sticker and a bead costs $12.10 altogether.
The marble costs $1.40 less than the sticker.
The bead costs $2.10 more than the sticker.
How much do 3 beads cost?