If the weights retained on the $2.36 \mathrm{~mm}, 1.18 \mathrm{~mm}, 600 \mu \mathrm{~m}$, and $300 \mu \mathrm{~m}$ sieves are $30 \%$, $35 \%, 15 \%$, and $20 \%$, respectively, of the total weight of an aggregate sample, then the fineness modulus of the sample is ___________ (rounded off to 2 decimal places).

In the context of construction project management, which of the following statements is/are true:

During determination of the bulk specific gravity of compacted bituminous specimen, the mass in air of the specimen is 1260 g and volume is $525 \mathrm{~cm}^3$. The density of water is $1.0 \mathrm{~g} / \mathrm{cm}^3$. The theoretical maximum specific gravity of mix is 2.510 .

The percentage air voids in the compacted specimen is __________ (rounded off to 2 decimal places).

Suppose $\lambda$ is an eigenvalue of matrix A and $x$ is the corresponding eigenvector. Let $x$ also be an eigenvector of the matrix $\mathrm{B}=\mathrm{A}-2 \mathrm{I}$, where I is the identity matrix. Then, the eigenvalue of B corresponding to the eigenvector $x$ is equal to