In a colony of 100 blocks of flats numbering 1 to 100, a school van stops at every sixth block while a school bus stops at every tenth block. On which stops will both of them stop if they start from the entrance of the colony?

Question

Philoid · Accepted Answer

First stop at which both van and bus stops = LCM of 6 and 10 = 30

Hence, the stops at which both of them stop = 30, 30 + 30 = 60 and 30 + 30 + 30 = 90