The size of 35 kg crushed rocks has been analyzed using sieving method. The results of the sieving process are tabulated in the below table. The density of the particle is 1550 kg/m³ and the shape factor are a = 0.8 and = 0.69, Calculate:

1. The specific area of particles (A_w) (mm²/g) for the material between 4-mesh and pan.
2. Number of particles in mixture (N_w) (particles/g) for the material between 4-mesh and pan
3. Number of particles in mixture (N_w) (particles/g) for the material FROM 4-mesh and 65-mesh and BETWEEN 4-mesh and 65-mesh
4. What fraction of the total number of particles in the 150/200 mesh increment?
5. If 90% of the crushed glass must have size less than 1.5mm, state whether or not the particles need to be crushed again?

Mesh	Mass fraction retained, xi
4	0.0000
6	0.0210
8	0.0490
10	0.1100
14	0.1800
20	0.2310
28	0.1490
35	0.1020
48	0.0580
65	0.0530
100	0.0370
150	0.0050
200	0.0030
Pan	0.0020