29 & 31.
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the first three are primes so we just need to factor 20 20=5x2^2 so the answer is 2^2x3x5=60
They will not. A queen size bed is 60" x 80" and a twin size is 39" x 75" and an XL twin would be 39" x 80". Two XL twin box springs are what you would use for a king size bed.
A parallelogram has 2 opposite equal acute angles and 2 opposite equal obtuse angles that add up to 360 degrees and so the angles are 60, 60 120 and 120 degrees.
This is not known for sure, but if Goldbach's conjectures are true, then 2.
2/3 of 60 = 40