They are both divisible by two.
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The even numbers in between 30 and 40 are; 32, 34, 36 and 38.
To find numbers between 30 and 40 that are divisible by both 4 and 9, we need to find the least common multiple of 4 and 9, which is 36. The numbers between 30 and 40 that are divisible by 4 and 9 are 36.
1 even number is in 36.
The even numbers are a mixture of both red and black. The numbers 2, 4, 6, 8, 10, 20, 22, 24, 26 and 28 are all black. The numbers 12, 14, 16, 18, 30, 32, 34 and 36 are all red.
=(32+34+36+38)/4 = 35