h+h-h=30 (h=30)

q+q+30=130 (q=50)

q-dbx-h=10

                 (50-dbx-30=10)

                 (50-dbx=40)

                 (50-40=dbx)

                 (10=dbx)

thus (5=axe)

30+50x5=?

80x5=?

400=?

The solution is 400.......thus 400=2000 sapphires !

helmet = 30 each

arrows = 50 each

double axes = 10 each

single ax = 5 

30 + 50 = 80 x 5 =400

Es simple

El resultado es 800

Saludos

280

30 + (50 x 5) = 280

*Order of operations. Without specifying parentheses, multiplication occurs before addition or subtraction.

This depends on the assumption that the symbol for double axes  represents an axe x 2, and therefore a single axe = 5 

An equally defensible position is that the crossed double axes is a single axe 'squared', so an axe squared = 10, and one axe = square root of 10 or 3.16.....

The solution then becomes

30 + (50 x 3.16) = 188