2d=3c. Find value of d

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OK, so I know the answer is 12. Why how?

I only got as far as d=3c/2

I can do all the others on dd's homework sheet, but how come I can't figure out this one?!

I don't think you can without knowing one of d or c.

Otherwise d=15 and c=10 also works well with each side of the bracket
= 30

Interested to see what others think though

D=3c/2 gives you D=6 c=4

Using your answer of 12 I mean! But other numbers would also work

You need more information to be able to work out what d is - you only know what d is compared to c.

What year is your DD in?

Is d=3c/2 not an acceptable answer?

Because you've got two variables you have to have an answer in terms of c; so = 3c/2 may well be the answer they are looking for.

If d is 12 then c is 8

If d is 6 then c is 4

If d is 10 then c is 6 2/3

You could keep going for ever.

Actually I agree that d = 3c/2 is the correct answer - you're not looking for a numerical value of d.

Thanks all. DD is in Y8 and We were doing some revision for 13+ entrance exams she has coming up.

This one was a bond 11+/12+ paper... With definitive answer of 12.

Glad my answer wasn't wrong. Maths not my strongest point but I'm ok with y7 algebra!

OK, so I know the answer is 12. Why how?

How is that an answer?

Do you mean d=12 or c=12

Do you mean 2d = 3c = 12 ?

If so then it is a pointless equation as you can calculate d and c without considering each other.

2d = 12, then d must be 6
3c = 12, then c must be 4

But you don't need to consider d and c together at any point to reach this conclusion.