You have two strands of decorative lights. Strand A changes color every
18 seconds and Strand B changes color every 42 seconds. Both strands just changed color. After how many seconds will the strands change color at
the same time again?

Both strands will change color at 126 seconds.

Step-by-step explanation:

In this case, find the least common mutiple or LCM.

EXAMPLE OF LCM:

There are two integers a and b marked as LCM ( a, b ), the LCM is the smallest positive integer that can be divisible by both a and b.

So LCM(18,42) =

The LCM is 126, it is the least common multiple.

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answer: input the dimensions of the room to be painted. click the button to calculate the amount of paint and man-hours needed for this job.

interior paint coverage depends on the brand of paint used. the coverage amount is listed on the label of the paint can. use this to adjust the values in the paint coverage section below. paint usually is applied at 350 to 400 square feet per gallon (primer at 200 to 300 square feet per gallon).

step-by-step explanation: