7+2
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5.
It is: 19-7 = 12
If seven less than half of the number is 35 then 7 plus 35 must be half of the number. 7 + 35 = 42 and if that is half the number the whole number must be 42 x 2, which is 84.
4*(N-7)
2, 3, 5, 7, 9, 11 are the six prime numbers less than 13, Three of these are less than seven. So, the probability that a randomly chosen prime number less than thirteen is less than seven is 3 divided by 6 or 0.5. Said another way the odds are 50/50.