Conner bought 2 clocks and 6 lamps which altogether cost £58.
On another occasion he bought 3 clocks and 12 lamps which cost £111.
What a bargain! How much does one clock cost? How much does one lamp cost?
Hint: The answers are whole numbers.
Topics: Starter  Algebra  Problem Solving  Simultaneous Equations
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Numbers and the Making of UsI initially heard this book described on the Grammar Girl podcast and immediately went to find out more about it. I now have it on my Christmas present wish list and am looking forward to receiving a copy (hint!). "Caleb Everett provides a fascinating account of the development of human numeracy, from innate abilities to the complexities of agricultural and trading societies, all viewed against the general background of human cultural evolution. He successfully draws together insights from linguistics, cognitive psychology, anthropology, and archaeology in a way that is accessible to the general reader as well as to specialists." more... 
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