Question 34373
Suppose the bricklayer work for 'X' hrs, the electrician works for (90-X) hrs

their pay will be 12X & 16*(90-X)

They get a total of $1350 for their work.

So, 12X + 16*(90-X) = 1350

Solving for X, you get 22.5, and the eletrician works for 67.5hrs