3 persons started running around circular ground together and complete one round in 12 , 18,21, seconds respectively. how much time will they meet again at starting point?

If 20 men take 15 days to to complete a job, in how many days can 25 men finish that work?

Which of the following is the correct order of evaluation for the below expression?
z = x + y * z / 4 % 2 - 1

Options
1) * / % + - =
2) = * / % + -
3) / * % - + =
4) * % / - + =

A shop stores x kg of rice. The first customer buys half this amount plus half a kg of rice. The second customer buys half the remaining amount plus half a kg of rice. Then the third customer also buy

1*2*3*4*5
11*12*13*14*15
21*22*23*24*25
16*17*18*19*20
6*7*8*9*10

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