Question

the perimeter of rectangle is 70 cm and the breath is 10 cm whats the area

Answer 1

$b=10cm \\ perimeter=70cm \\ l×b=70 \\ l×10=70 \\ l=\dfrac{70}{10} \\ l=7cm \\ {\boxed{Area=l×b}} \\ 7×10=70cm$

Answer 2

$b=10cm \\ perimeter=70cm \\ l×b=70 \\ l×10=70 \\ l=\dfrac{70}{10} \\ l=7cm \\ {\boxed{Area=l×b}} \\ 7×10=70cm$