Math Olympiad 2( Week 36 Quiz 7) 1. The equation 11+2+12=1 is incorrect. Correct it by exchanging ONLY one digit or sign with another in the equation. Please write your corrected equation (Only one is needed) in the blank. 2. What time is it 40 minutes before 10:05? (Express as HH:MM format) 3. Steve was born 5 years after his sister Mary. Next year, Steve will have his 10th year birthday party. How old is Mary now? 4. There are 9 rungs on a ladder. Nancy is on the 1st rung and David is on the 7th rung. How many steps is Nancy apart from David? 5. 9 children are numbered from 1 to 9. The boys have the odd numbers, and the girls have the even numbers. How many girls are there? 6. If school begins at 7:30 AM and ends at 1:30 PM in a school day, how many hours are students at school in a day? 7. A team T-shirts are numbered from 6 to 36 consecutively. All the even number T-shirts are assigned to group A and all the odd number T-shirts are assigned to group B. How many people are there in group A? 8. It will take a clock 2 seconds to chime twice. How many seconds will it take to chime 10 times? (Assume that each chiming itself does not take any time). 9. 46 boys stand in a line. There is a girl between each pair of boys. How many girls are there in the line? 10. Oak trees planted around a circular garden are one meter apart. There are 42 oak trees in total. What is the circumference of the garden in meters? 11. Cut a strip of wire into 19 pieces. How many cuts need to be made? 12. The equation 10-9=19 is incorrect. Correct it by exchanging ONLY one digit or sign with another in the equation. Please write your corrected equation (Only one is needed) in the blank. 13. The equation 17+6=5-2 is incorrect. Correct it by moving ONLY one digit or sign to another place within the equation. Please write your corrected equation (Only one is needed) in the blank. 14. The equation 16+5=1 is incorrect. Correct it by moving ONLY one digit or sign to another place within the equation. Please write your corrected equation (Only one is needed) in the blank. 15. The clock below was behind the real time by 3 minutes. Which of the following was the correct real time then?
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