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CBSE Class 10 Answered

2. Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together?
(A) 4 (B) 10 (C) 15 (D) 16
 
This is a olympaid question so solve wisely but explain with steps
Asked by sucharitasahoo1 | 30 Nov, 2017, 08:58: PM
answered-by-expert Expert Answer
begin mathsize 16px style LCM space of space 2 comma space 4 comma space 6 comma space 8 comma space 10 space and space 12 space equals space 120 space seconds space equals 2 space minutes
Hence comma space all space the space 6 space bells space will space ring space together space in space every space 2 space minutes.
rightwards double arrow Number space of space times space they space will space ring space together space in space 60 space minutes equals 60 over 2 plus 1 equals 30 plus 1 equals 31 end style
Answered by Rashmi Khot | 01 Dec, 2017, 09:34: AM
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