equivalent fractions

[christy053]

hi what would the answer to this be if you had to fill in the missins number in th equivalent fraction 515 = 1? Help i have them for homework but i cant do them unless i understand them please and is this one correct
12/15=4/5
thanks

[angeldraws]

Not sure if i understand the first question - is it 515 over 1??

The second question appears to be correct......

[angeldraws]

It's okay - no need to thank me!!!