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The $10$ m overhang beam loaded as shown, having a width of $300$ mm and overall depth of $600$ mm$,$ supports a uniformly

distributed service load of $20$ kN$/$m of live load and $30$ kN$/$m dead load $($excluding the weight concrete$).$ For the section the

maximum bending moment occur between A and B$,$ how many $25$ mm diameter steel bars are required for the top and bottom

reinforcement using Ultimate stress design method, Concrete strength is $20$ MPa and steel yield strength is $275$ MPa, concrete

cover from extreme fiber to the centroid of reinforcement is $70$ mm$.$

answer is:

n$$s $=1174\mathrm{.}07$ mm $2=3$ pcs

ns$=4754\mathrm{.}67$ mm $2=10$ pcs

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