Help- type 19 (k) questions

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Blitz
Posts: 874
Joined: Wed Aug 25, 2010 3:58 pm

Help- type 19 (k) questions

Post by Blitz »

Can anyone help solve these:

27 (20) 11 16 (12) 8 6 (?) 18

9 (15) 45 25 (12) 50 16 (?) 32

12 (16) 3 28 (32) 7 4 (?) 1

Thanks
KeepCool
Posts: 155
Joined: Mon Oct 18, 2010 10:01 am

Re: Help- type 19 (k) questions

Post by KeepCool »

Top one - not sure - could it be:

27 - 11 = 16 + 4 = 20
etc.
6 - 18 = -12 + 4 = -8 ??

12 divided by 3 = 4 Add 4 to 16
28 divided by 7 = 4 Add 4 to 28
4 divided by 1 =4 Add 4 to 4
KeepCool
Posts: 155
Joined: Mon Oct 18, 2010 10:01 am

Re: Help- type 19 (k) questions

Post by KeepCool »

second one is 45 - 9 = 36 - 1 and halve it

etc.

8)
Minesatea
Posts: 1234
Joined: Sat Oct 31, 2009 12:08 am

Re: Help- type 19 (k) questions

Post by Minesatea »

The third one is

divide 1st number by 2nd then add the first number so

4/1 = 4 +4 = 8
Minesatea
Posts: 1234
Joined: Sat Oct 31, 2009 12:08 am

Re: Help- type 19 (k) questions

Post by Minesatea »

DD says number 2 is

divide second number by first and add 10


32/16 = 2 +10 = 12
patricia
Posts: 2803
Joined: Mon Jan 30, 2006 5:07 pm

Re: Help- type 19 (k) questions

Post by patricia »

Always keep to basic rules...

Middle number has been made using the numbers either side.
Same rule must apply for all 3 sets.
Sometimes 1 operation. Sometimes 2.
Second operation can be:

1] + - x / [divide sign!] the same number.
2] doubling/halving
3] + - x / [divide sign] the number on the left or right of the middle number.

Whilst teaching, I always say:

If the number in the middle is bigger than the 2 either side then your 1st operation is probably adding or multiplying.

If the number in the middle is smaller that at least one of the numbers either side, then your 1st operation is probably subtracting or dividing.

I always emphasise the word probably, because there are times when this rule will not work, they are not to panic, if it doesn't work, that’s fine, just try the other 2 operations.


27 (20) 11 16 (12) 8 6 (?) 18

Assuming the numbers in the 3rd bracket are the wrong way round 18 (?) 6 or the incorrect numbers given.

27 minus 11 = 16 add 4 = 20
16 minus 8 = 8 add 4 =12
18 minus 6 = 12 add 4 = 16


9 (15) 45 25 (12) 50 16 (?) 32


45 divided by 9 = 5 add 10 = 15
50 divided by 25 = 2 add 10 = 12
32 divided by 16 = 2 add 10 = 12

12 (16) 3 28 (32) 7 4 (?) 1


12 divided by 3 = 4 add the number on the left of the middle number = 16
28 divided by 7 = 4 add the number on the left of the middle number = 32
4 divided by 1 = 4 add the number on the left of the middle number = 8
Blitz
Posts: 874
Joined: Wed Aug 25, 2010 3:58 pm

Re: Help- type 19 (k) questions

Post by Blitz »

Thank you!! I can sleep tonight! :D
lakshmi
Posts: 20
Joined: Wed Nov 24, 2010 12:00 am

Re: Help- type 19 (k) questions

Post by lakshmi »

I am not sure whether I should start a new topic for this, but can you please help me with these?

( 13 [ 10 ] 3 )( 17 [ 21 ] 10 )( 20 [ ? ] 7 )
( 3 [ 10 ] 7 )( 9 [ 27 ] 3 ) ( 8 [ ? ] 8 )

Thanks and Regards
Lakshmi
Minesatea
Posts: 1234
Joined: Sat Oct 31, 2009 12:08 am

Re: Help- type 19 (k) questions

Post by Minesatea »

No.1 Add both numbers together then subtract 6


20 + 7 -6 = 21
KeepCool
Posts: 155
Joined: Mon Oct 18, 2010 10:01 am

Re: Help- type 19 (k) questions

Post by KeepCool »

Minesatea wrote:No.1 Add both numbers together then subtract 6


20 + 7 -6 = 21
That's wrong - it doesn't work on the last one.
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