Posted by sean on Wednesday, October 3, 2012 at 8:48am.
a red light winks every 6 seconds, a white one every 10 seconds, and a green one every 14 seconds. how often they wink together?

math  Steve, Wednesday, October 3, 2012 at 9:59am
6 = 2*3
10 = 2*5
14 = 2*7
LCM(6,10,14) = 2*3*5*7 = 210
so, every 210 seconds they will blink at the same time
Answer This Question
Related Questions
 Math  the green light flashes every 3 seconds,the red every 5 seconds and white...
 Math  If a red light flashes every 3 seconds, a blue light flashes every 4 ...
 Math  A bell rings every 2 seconds, and a bird chirps every 3 seconds. If the ...
 mathematics  A bell rings every 2 seconds, and a bird chirps every 3 seconds. ...
 math  three fireworks are fired at the same time. The first one is fired every ...
 math  if one sign binks every 7 seconds and the other sign blinks every 9 ...
 math  on a radio tower, a red light flashes every 6 seconds and a blue light ...
 math (NEW ANSWERS)  identify the fraction that is equivalent to 3/8. A.15/32 B....
 math  One sign blinks every 9 seconds. The other sign blinks every 15 seconds. ...
 6 grade math  a manager turns on the restaurants two neon signs at the same ...
More Related Questions