How can i find the the masses of two isotopes given thier abundance and the atomic mass

isotope 1 has 37.40 abundance and isotope 2 has 62.60 abundance

the sum of the masses is 371.9087

how can i calculate the masses of both isotopes given this info

i set my problem up like this 371.9087= (.3740 )(mass of isotope 1) + (.6260)(mass of isotope 2)

not sure if its right but i got the wrong answer :/

I think you have left out some info... the average atomic mass.

You say the sum of the masses is 371.9087
the way I read the question this is not the average atomic mass, it is the sum of the two masses.

let mass isotope 1 = a
let mass isotope 2 = b

So
average atomic mass = (.3740 )(a) + (.6260)(b)

Now
a + b = 371.9087
thus
a = 371.9087 - b

substitute this into the other equation and you can solve for b

average atomic mass = (.3740 )(371.9087 - b) + (.6260)(b)

once you rearrange it you shoud end up with
b = (average atomic mass - 139.09) / 2

Just add the average atomic mass you were hopefully given in and solve for b, which will then allow you to find a.