a$.$ The third$-$point loading flexure strength test was performed on a concrete beam having a cross

section of $0\mathrm{.}15$ m by $0\mathrm{.}15$ m and a span of $0\mathrm{.}45$ m$.$ If the load at failure was $35\mathrm{.}7$ kN$,$

calculate the flexure strength of the concrete.

b$.$ A third$-$point loading flexural $($bending$)$ test was performed on a concrete beam with a

cross section of $4$in x $4$in and a span of $8$ in$.$ If the failure load was $6,000$ lb$,$ find the

modulus of rupture.