Question

The number of students at jefferson school is even. The number has three digits. The digit in the ten place is 4. write there number that could be how many students are there at jefferson school. Explain how many you know your answer are correct.

Answer 1

Let's assign three blanks for each digit of the unknown number. But let's fill in the tens digit because it is already specified.

_ 4 _

The last digit should be even to make it even. The possible digits for this are 2, 4, 6, and 8. The first digit could be any digit from 1 to 9. Therefore, the possible answers are 

142  242  342  442  542  642  742  842  942
144  244  344  444  544  644  744  844  944
146  246  346  446  546  646  746  846  946
148  248  348  448  548  648  748  848  948

Therefore, there are a total of 36 possible answers.