Sunday, March 15, 2009
If Ali needs to take medicine A every 3 hours, medicine B every 5 hours, medicine C every 7 hours and medicine D every 9 hours, when is the next time he will take all the medicine at the same time if he take all together in a Wednesday 5.00 pm ?
Hint: Find the LCM of the time and add it to the time he take the medicine together
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