math test in HK

[ndsids]

a=7
g=5+a
a= 1+ 3b

Q : a+g+b=?

 

[ccc]

a=7
g=12
b=2

 

[CanChn]

a=7
g=5+a
a= 1+ 3b

Q : a+g+b=?

a=7
g=7
b=2

7=5+7
0=5
?

 

[ndsids]

that is for 6year old kid

 

[ccc]

7=5+7
0=5
?

哈，g=12

 

[ndsids]

you give me $10. i give you 10 coke..you give me 2 empty can i give you one coke.how many coke can you drink for $ 10 ??

 

[今天]

there are 28 handshakes at a party where each person greets every other by shaking hands. How many people were there in the party?

 

[ndsids]

there are 28 handshakes at a party where each person greets every other by shaking hands. How many people were there in the party?

8

 

[ccc]

8

If there are 15 people in a room and each person shakes hands with every other person in the room only once, how many handshakes will take place?

 

[ndsids]

3..3..4..5..6..7..8..9..10..11..12..13..14=?

 

[ndsids]

105

 

[ccc]

3..3..4..5..6..7..8..9..10..11..12..13..14=?

(n(n-1)/2

 

[ndsids]

(n(n-1)/2

never seen ( before the first n