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 number that dev could have started with.

  {12, 13}

Step-by-step explanation:

Whole numbers that round to 50 will be in the range 45 to 54. Multiples of 4 in that range are 48 and 52.

  48 = 4·12

  52 = 4·13

Dev's number could be either 12 or 13.

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