Answer:

Let the mass of a pumpkin, a pineapple and a pomelo be x, y and z respectively. To simplify the problem, remove 1 pumpkin from each plate.

We then have: Since 2y is less than 2z, so y is less than z. Since 2z is less than x + y, and y is less than z, then x has to be more than z. Hence, y is less than z, which is less than x. Therefore, y + z is less than 2z but more than 2y, so D should be placed between A and B.

Answer:

Ten boys played a total of 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 45 games.

3 points were given for a win-

45 × 3 = 135 points would have been given out if there were no draws.

135 – 125 = 10 points

10 games were draws.

Primary 5 -

One day last week, Bobo and Qiqi both said, "I lied yesterday."

On which day of the week did that happen?

Answer:

Bobo could only say that on Mon, Fri, Sat, Sun. Qiqi could only say that on Tue, Wed, Thu and Fri. Only on Friday can both of them say that.

Primary 5 -

Answer:

In 1 week, John is able to save $15 more than James

315 – 210 = 105 John saved $105 more than James.

105 ÷ 15 = 7 It took John 7 weeks to save $315.

Primary 5 -

Answer: 30

Primary 4 -

Amir does not like pizza or nasi lemak. Bala does not like pizza.

Name the favourite food of each person.

Answer:

Since Amir likes neither pizza nor nasi lemak, then satay must be his favourite food. Since Bala does not like pizza and it’s not satay (Amir’s favourite food), then nasi lemak must be Bala’s favourite, and so Chandra’s favourite food must be pizza.

Primary 4 -

Answer:

The least number of pupils who answered all 4 questions correctly happens when different pupils could not answer different questions. Since 13 pupils got Q1 wrong, 8 got Q2 wrong, 9 got Q3 wrong and 4 got Q4 wrong, then 42 – (13 + 8 + 9 + 4) = 8.

At least 8 pupils answered all 4 questions correctly.

Primary 4 -

Anne: I am 22 years old. I am 2 years younger than Betty. I am 1 year older than Carol.

Betty: I am not the youngest. Carol and I are 3 years apart. Carol is 25 years old.

Carol: I am younger than Anne. Anne is 23 years old. Betty is 3 years older than Anne.

If only two of the three statements made by each lady are true, find the age of Anne.

Primary 3 -

Show where he should paste 5 more stickers so that there are 3 stickers on each side of the square.

Answer:

Primary 3 -

The total number of storybooks that John and Lionel have is 20.

The total number of storybooks that Ken and Lionel have is 31.

Answer:

Total number that John, Ken and Lionel have = (25 + 20 + 31) ÷ 2 = 38

Number of books Lionel has = 38 – 25 = 13

Number of books Ken has = 38 – 20 = 18

Number of books John has = 38 – 31 = 7

Ken has the most number of books. He has 18 books.

Primary 3 -

Kara guessed 25, Kegan guessed 31, Calida guessed 29, Eugene guessed 24 and David guessed 27.

Two guesses were wrong by 2; one guess was wrong by 3 and one guess was wrong by 4. Only one guess was correct.

Who guessed the correct number of balloons?

Answer:

Arrange the guesses in ascending order: 24 -

The answer is 27 since 25 and 29 are wrong by 2; and 24 is wrong by 3; and 31 is wrong by 4.

Therefore, it was David who guessed correctly.