Math competition(without using calculator)

In the figure,triangle ABD ~ triangle BCD .Find the length of AB

• 4cm

• 5cm

• 6cm

• 7cm

Answer explanation

Which one is an irrational number?

• 丌　　

• 0.333…

• 12.5

• 0.12

159999=?

• 21 x 21 x 399

• 19 x 21 x 401

• 199 x 201 x 4001

• 3999 x 4001

If F = 86,C = ?

• 25

• 30

• 35

• 40

Find the answer in above figure

• 49/100

• 50/101

• 99/100

• 100/101

The coefficient of xy in the polynomial -(x+y)(x-3y) is

• 2

• -2

• 3

• -3

If 3x-y = 12,what is the value of 8^x/2^y

• 4096

• 256

• 64

• The value cannot be determined from the information given.

How many math teachers are there in Ho Fung College?

• 8

• 9

• 10

• 11

The cost of a ring $125,000.The selling price is $195,250.What is the profit percentage?

• 56.2%

• 52.6%

• 65.2%

• 26.2%

密碼 = ?

• 8213

• 2137

• 　8712

• 4312