Question

1) The traffic lights at three different road crossing change after every 48 seconds, 72
seconds and 108 seconds respectively. If they change simultaneously at 7 am, at what
time will they change simultaneously again?

2) Solve -7(-5)+2(-10)-3(3)

3) Namita travels 20 km 50 m every day. Out of this she travels 10 km 200 m by bus and the
rest by auto. How much distance does she travel by auto?

4) Write the seven consecutive composite numbers less than 100 so that there is no prime
number between them.

5) If a number is divisible by 5 and 12 then by which other number will it be divisible.​

Answer 1

Answer:

5 . 5 and 12 are co-primes and we know that if a number is divisible by two co-prime ,then it is a known fact that it is also divisible by their product . The product of 5 and 12 is 60. Hence it is divisible by 60

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