There were some magnets in a box for sale. Mrs Frank bought ½ of the magnets in the box and was given 5 magnets free of charge. Next, Mrs Samson bought ½ of the remaining magnets and was given 3 magnets free of charge.Later, Mrs Parker bought ½ of the remaining magnets and was given 2 magnets free of charge.If there were a dozen magnets left in the box, how many magnets were there at first? [4 marks][Answer given: 134]
12 + 2 = 14
14 x 2 = 28
28 + 3 = 31
31 x 2 = 62
62 + 5 = 67
67 x 2 = 134 magnets
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