Question

Martina finished her chemistry assignment in 2/5 hours. Then she completed her math assignment in 1/4 hrs. What was the total amount of time martina spent doing these two assignment

Answer 1

$\text {Total time spent :}$

   $\dfrac{2}{5} + \dfrac{1}{4}$

$= \dfrac{2 \times 4}{5 \times 4} + \dfrac{1 \times 5}{4 \times 5}$

$= \dfrac{8}{20} + \dfrac{5}{20}$

$= \dfrac{13}{20} \text { hour}$