when mixing a quantity of dyes four different colours are used in the ratio of 7:3:19:5. if the mass of the first dye used is 3.5 grams determine the total mass of the dyes used.

7/3 = w/x = 3.5/x,

x = 3.5(3)/7 = 1.5 grams

3/19 = x/y = 1.5/y,

y = 1.5(19)/3 = 9.5 grams

19/5 = y/z = 9.5/z,

z = 9.5(5)/19 = 2.5.

Total mass of dye = w + x + y + z = ?