Mathematics, 30.01.2020 00:52 faithyholcomb

Mr. rr the rreliable rrobot has been programmed to whistle every $18$ seconds and do a jumping jack every $42$ seconds, starting from the moment he is turned on. (for example, he does his first jumping jack $42$ seconds after he is turned on.)

how many times during the first $15$ minutes after activation will mr. rr whistle and do a jumping jack at the same instant?

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Mr. rr the rreliable rrobot has been programmed to whistle every $18$ seconds and do a jumping jack...