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22 May, 16:14

Dev thinks of a whole number. He multiplies it by 4. He rounds his answer to the nearest 10. The result is 50.

Write all the possible numbers that Dev could have started with.

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  1. 22 May, 18:59
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    There is only one answer, which is 4*12. Because 4*12=48, then rounded is 50, but 4*11=44 and can't be rounded to 50, and 4*13=52 and can't be rounded to 50.
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