Hector

Hector has 3/4 hours to spend completing his homework. He wants to spend 1/3 of his time on math homework, 10 minutes on reading homework, and the remaining time on science homework. How much time, in minutes, does he have to spend on his SCIENCE homework?

Correct answer:

x =  20 min

Step-by-step explanation:

$$\begin{gathered} t=0.75\text{h}\to \text{min}=0.75\cdot 60\text{min}=45\text{min} \\ m=\frac{1}{3}\cdot t=\frac{1}{3}\cdot 45=\frac{1\cdot 45}{3}=\frac{45}{3}=15\text{min} \\ r=10\text{min} \\ x=s=t-m-r=45-15-10=20\text{min} \end{gathered}$$

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