Jose thinks of a number. "If I double my number and add 5 the answer is 19"  Joseph thinks of a number. "If I multiply my number by 2 and add 2 the answer is 28"  
Joshua thinks of a number. "If I add 5 to my number then divide the result by 2, the answer is 11"  Juan thinks of a number. "If I multiply my number by 5 and subtract 3 then multiply the result by 3, the answer is 2 less than 158" 
What numbers are they thinking about?
Topics: Starter  Algebra  Puzzles
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Texas Instruments Nspire CalculatorThis handheld device and companion software are designed to generate opportunities for classroom exploration and to promote greater understanding of core concepts in the mathematics and science classroom. TINspire technology has been developed through sound classroom research which shows that "linked multiple representation are crucial in development of conceptual understanding and it is feasible only through use of a technology such as TINspire, which provides simultaneous, dynamically linked representations of graphs, equations, data, and verbal explanations, such that a change in one representation is immediately reflected in the others. For the young people in your life it is a great investment. Bought as a gift for a special occasion but useful for many years to come as the young person turns into an Alevel candidate then works their way through university. more... 
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