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Anonymous
You need at least two fractions to find something in common.
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The least common denominator (LCD) is 1.
The answer is 15.
LCD(10, 15) = 30
LCM(15, 5, 8) = 120
30
120
210
15
LCD(49, 21) = 147
40... lets check 5= 10 15 20 25 30 35 40 8= 16 24 32 40 yup its 40
245