Help please. Jennie and Bill have a combined age of 50. 16 years ago Jennie was twice as old as Bill. Please can you help with the workin out.

Let their current ages be J and B.

J + B = 50
(J-16) = 2 (B-16)

Substitute 50-B for J in the previous equation and solve for B.

50-B -16 = 2B -32
3 B = 66
You finish it