Level 2
The distance between Jenny's home and the bookstore is 500 m. After walking a distance from her home to the bookstore, she stopped and walked 90 m back to a pet shop. If the pet shop is 150 m away from her home, how far had she walked before she stopped and walked back?

Level 3
A coin bank contains some twenty-cent and fifty-cent coins in the ratio of 2 : 5.
When 10 fifty-cent coins are taken out and
exchanged with some twenty-cent coins of the same value,
the ratio became 8 : 9.
Find the sum of money in the coin box in dollars.

Level 2
A pen costs $z while a book costs 90¢ less than the pen.

1. What is the cost of 2 pens and 1 book? Express your answer in terms of p in its simplest form.
2. Abel wants to buy 2 pens and 1 book but is short of 30 cents. If the book costs $1.10, how much money does Alex have?

Level 2
Priscilla has more than 20 pencils but fewer than 40 pencils The pencils can be packed into bags of 4 pencils without any remainder. The pencils can also be packed into bags of 6 pencils without any remainder. What is the most number of pencils that Priscilla has?

Level 3
A rectangular tank measuring 60 cm by 50 cm by 25 cm was to be filled with water by two taps, A and B. Tap A which fills the tank at a rate of 8ℓ per minute was first turned on for 5 minutes before Tap B was turned on as well. If the tank was filled to the brim in a total of 7 minutes from the time when Tap A was first turned on, what is the rate at which Tap B fills the tank? Give the answer in ℓ per minute correct to 1 decimal place.

Level 1
Round off 415 to the nearest hundred. Then estimate 415 x 7.