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For 49,57: 2793
For 4/9, 5/7: 63
It is 2793.
The LCD is 9.
49 x 2 = 98 14 x 7 = 98 98 is the LCD
4x2+49 First multiply then addition. 8+49 =57 Answer is 57.
294
4900
196
LCD(49, 21) = 147
3.8596
147.
2205
49 and 57 are both co-prime when compared to each other.
LCD(49, 72) = 3528