Part I
It is quite easy to get within one - either with 23 = (7 + 3) * 3 - 7, or with 25 = (7 * 3) + 7 - 3
Or you can get even closer with 23.33333... = (3 + 7) * 7 / 3
A 'meta solution', goes as follows: (i) you can get 25 easily, and (ii) you don't set easy puzzles, so it must be possible to get 24. We can't fault the approach...
And finally, to prove that right, the solution is 24 = (3 + (3 / 7)) * 7
Part II
This one you can get exactly as well – with 24 = 6 / ( 1 - ( 3 / 4 ) )
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