Question
Three streetlights flash together. Each of them then
flashes after 0.35 seconds, 0.2 seconds, and 0.105 seconds respectively. After how many seconds will they all flash together again?Solution
0.35,  0.2,   0.105 multiplied by 0.001. 350,200,105 LCM of 350,200,105=4200 4200 × 0.001=4.2 =4.2
A sum of money doubles itself in 5 years in how many years it will be 3 times?
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A certain sum of money will be doubled in 25 years at the rate of simple interest percent per annum is:
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