Unit 6 · Algebra
1000 − 530 − 140 — Farm Costs How Many Points?
Lesson 4 of 12
About this lesson
A player starts with 1000 game points, buys 5 buildings at 106 each and 1 farm, and has 140 left. What did the farm cost? This is a classic working-backwards equation: start − buildings − farm = leftover. The trap is option C (470) — students who calculate 1000 − 530 = 470 correctly but forget to subtract the 140 points remaining.
Chapters
Question
I am playing a computer game and I have 1000 points.
In the game, I buy 5 buildings, each costing 106 points. I also buy 1 farm.
I have 140 points left afterwards.
How many points did the farm cost?
Take your OC prep further
- Sample questions & worked solutions across core OC topics
- Digital exam simulator with interactive practice sets
- Personalised progress tracking across all your devices
Already have an account? Log in here
No payment required. Compare OC plans
Give Your Child the Best Chance at OC Entry
Join NSW families preparing their children for the Opportunity Class Placement Test with the most realistic online OC practice tests available. First tests free—no credit card required.
Claim Your Free OC Practice Tests