Asked by Kd

In a school, one bell rings after every 30 minutes while the other rings after every 35 minutes. If the two bell rang together at 8:15 a. m., at what. Time did they ring together next?
Answered by oobleck
LCM(35,90) = 630
so what is 630 minutes after 8:15 ?
Answered by R_scott
7 * 30 = 6 * 35 = 210

210 minutes after 8:15 a.m.
Answered by oobleck
oops. R_scott was right. I guess I better clean my glasses.
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