A water tank has two pipes of different sizes to fill water. One pipe can fill \( \frac{1}{5} \) part of the tank in 1 hour and another pipe can fill \( \frac{1}{4} \) part in 1 hour. (i) If both the pipes are opened at a time, what parts of the tank would be filled in 2 hours? (ii) If the capacity of the tank is 10,000 litres, how much water would be filled in 2 hours?

11. You begin a hike in Death Valley, California, at an elevation of -86 meter You hike to a point of elevation at 45 meters. What is your change in elevation?

5. \( (17-12)= \)

7. \( 6-17-4 \)

Use the model to find \( 530 \div 5 \). First, find the missing side lengths. Then, find the quotient. \( 530 \div 5=\square \)

To be adopted, a resolution must be approved by at least \( 2 / 3 \) of the members of the assembly. There are 435 members in the assembly. Find the number of members who must approve the resolution for it to be adopted.