Convert the ratio 2:3:5 to 4:6:10 Before 4:6:10 End. 7:9:13 Note the change is 3 units for each person.. 3units= 42... 1 unit == ??? Can u solve from here...

Sorry why x 2

To make the change of ratio for each person the same as all three of them bought 42 marbles each..

Constant difference. U can make use of the diff betwn A and B or diff betwn B and C. Can use this method if the diffence is the same.

Thank you very much

(x/0.9-70)* 1.2 + x = 1428 x=648

I think have a typo somewhere. At present total age already 56.

Answer is TWO years ago..!! haahaa

54

thanks. how do we get the answer? is there any formula for it?

Thanks!

For me is pattern. 2 4 6 24 3 5 7 30 4 6 8 36 5 7 9 42 6 8 10 48 7 9 11 54 8 10 12 60 9 11 13 66 10 12 14 72 Every increase in number will result in an increment of 6

54. Sum of the 3 numbers and multiply by 2

54

Would this not be a crime to have this as an exam question ?

(7+9+11) x 2 = 54

2(2+4+6)=24 2(10+12+14)=72 2(6+8+10)=48 2(7+9+11)=54

Y x2?

Answer. 54

thanks all.

I find it simple way. Mutiply 2nd col by 6 will provide the 4th col. Hence the answer is 54

54

Mun Wai, agree that this is not appropriate as an exam question.

Mun Wai... You are absolutely right! Lolz...

Nice to see you after so long Mun Wai!