Answer:
20
The denominators of 3 /10 and 1 /4 are 10 and 4.
The factors of 10 are 2 × 5 and 2 × 2
Therfore the LCD should have two 2's and one 5.
This means the answer is:
2 × 2 × 5 = 20
I hope this helps :)
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