39/4=9.
59/4=14.
add 14.+9.=23
now divide 23/4=5
40 is the first number evenly divided by 4 and is the 10th multiple of 4 (4*10=40)
56 is the last number evenly divisible by 4 and is the 14th multiple of 4 ( 4*14 =56)
14-10 = 4 +1 = 5
there are 5 numbers evenly divisible by 4
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