Answer :
To find the earliest (least) time, they will start preparing a new card together, we find the LCM of 10, 16 and 20.
10 = 2× 5, 16 = 24
20 = 22 × 5
LCM = 24 × 5 = 16 × 5 = 80 minutes.
They will start preparing a new card together after 80 minutes.
Tagging |||Maths||Real Numbers||The Fundamental Theorem of Arithmetic
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