4MA1/2FR Jan 2020, Question 17: Constructing Equations
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2FR (Foundation) · Calculator · 4 marks
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The question, in short
Form an equation from tins A, B and C holding x, 4x and x − 7 buttons totalling 137, then find how many buttons are in tin C.
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Solution · 4 marks
- 1Tin A = x, tin B = 4x, tin C = x − 7
- 2x + 4x + x − 7 = 137, so 6x − 7 = 137
- 36x = 144, so x = 24
- 4Tin C = 24 − 7 = 17
Answer17
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