Math Olympiad 1

Challenging Questions( Week 50 Practice)

1. The total age of Eric and his younger sister Jessica is 12. If Eric was born at an odd number year, then Jessica must be born at

an even number year an odd number year

2. John has 6 black horses and 5 white horses. Richard has an equal number of horses as John has. How many horses does they have together?

3. Last year, Joe was 15 lb lighter than Susan. This year, after Joe gained 12 lb, he has the same weight as Susan now.
Did Susan gain or loss weight in the year?

gained weight

lost weight

By how much (in lb)?

4. Below were two snapshots of a clock taken in the afternoon of a certain day. How many times did the minute hand meet with the hour hand during the time that the two snapshots were taken?

A	B	C
6	5	8

5. If you count by 9 from 9, you get a series of numbers 9, 18, 27, 36, .... What is the 2-digit number in the series with its tens digit being 3 more than its ones digit?

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