参考答案:

　　1.Correct Answer: 70

　　Explanation:

　　49 = 70/100 x maximum mark

　　(49 x 100)/ 70 = maximum = 70

　　2.Correct Answer: 215

　　Explanation:

　　Factorize 860

　　860 = 2 x 430 = 2 x 2 x 215 (No need to go any further because 215 is odd)

　　3.Correct Answer: 900

　　Explanation:

　　If ¾ of the remainder went to A, then ¼ of the remainder went to B.

　　The remainder is ¾ of the money raised = ¾ (4800)

　　¼ x ¾ x 4800 = 3/16 x 4800 = 900

　　4.Correct Answer: 3.20

　　Explanation:

　　If you clean 6.5 pounds of clothes you will have to pay for 7 pounds.(That is what ‘per part thereof’ means)

　　The first 3 pounds cost $2; the remaining 4 pounds will cost 4 x .3 dollars = 1.2

　　Total cost =3.2

　　5.Correct Answer: 7

　　Explanation:

　　Factorize the quadratic.

　　(x + 1)(x -7) = 0

　　x = -1 or 7, but since we are told x > 0, x = 7

　　6.Correct Answer: 16

　　Explanation:

　　All circles are similar figures, so we can use the relationship that says if we take the ratio of corresponding linear dimensions (like the radius, the circumference, or corresponding arc), the ratio of the areas will be the square of the linear ratio.

　　The ratio of diameter of circle A to that of circle B = 1: 4

　　The areas are in the ratio (1)² : (4)² = 1 : 16

　　Hence circle B is 16 times larger.

　　7.Correct Answer: 21

　　Explanation:

　　3a + 5b = 85 (where a= number of apples, and b = number of oranges)

　　5a + 3b = 83

　　Add the pair of simultaneous equations

　　8a + 8 b = 168

　　a + b = 21

　　8.Correct Answer: 2/3

　　Explanation:

　　The total number of beads is 15

　　Of these 10 are either red or white

　　So the chance of drawing red or white = 10/15 = 2/3

　　9.Correct Answer: 2

　　Explanation:

　　When folded up, if the square with 5 dots is the bottom, then a will be the top.

　　Since opposite faces must add up to 7, A must have 2 dots.

　　10.Correct Answer: 8

　　Explanation:

　　The median of a set of integers is the middle number in the ranked series. If there is an even number of terms in the series, the median will be the average of the two middle terms. Here we have ten terms. The median is half-way between 3 and 4 and so we need four integers less than 3 and four integers more than 4 to complete the list.

　　The greatest number will be 4 + 4 = 8.

　　The best way to do these problems if the numbers are small is to write out the list:

　　-1, 0, 1, 2, 3, 4, 5, 6, 7, 8