Which ratio is equivalent to 24: 2824: 28 ?

a.4: 74: 7

b.12: 1612: 16

c.18: 2118: 21

d.48: 5848: 58

The key to solving this is to look at the 24 and the 28. First, look at option A.4:74:7

To have 28 equal to 7, you need to divide by 4. But 24 divided by 4 equal 6, so option A doesn't work.

Option B, 12:1612:16. To have 24 equal to 12, divide by 2. But 28 divided by 2 is 14, not 16. Option B doesn't work either.

Now Option D. 48:5848:58 To have 24 equal to 48, multiply by 2. But 28 multiplied by 2 is 56, not 58. Option D does not work.

This only leaves option C.