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9. Traffic lights at three different road crossings change after every 1 minute, 1 minute
20 seconds and 2 minutes, respectively. If they change simultaneously at 12 noon, at
what time will they change simultaneously again?
10. In a school, 48 girls and 32 boys are selected to participate in annual day function.
They have to participate in teams and each team must have the same number of
girls and the same number of boys. What is the greatest number of teams that can
participate in the function? How many girls and boys CompetenCy-Based Question
will be in each team?

11. The HCF and LCM of two numbers are 44 and 264, respectively. The first number
when divided by 2 gives 44 as quotient. Find the second number.
12. Verify the property “the product of two numbers = the product of LCM and HCF
of the numbers'' for the given numbers.
(a) 37 and 29 (b) 70 and 168

Brain Sizzlers

1. I am a 3-digit number. The sum of my digits is 5 and I am prime too. If my ones
and hundreds digits are interchanged, I still remain prime. Who am I?

2. There are 360 erasers and 456 sharpeners. These articles are to be arranged in
piles containing the same number of articles. Find the greatest number of articles
possible in each pile. Also, find the number of piles formed.

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