exam Maths Puzzle Numerical Ability

To determine the number of deer in a game preserve, a conservationist catches 386 deer, tags them and lets them loose. Later, 702 deer are caught; 234 of them are tagged. How many deer are in the preserve?

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Can you please help me with the following equations: I am having the hardest times remembering how to simplify and multiply fractions in a linear equation:

1. 1/2(2x-1) - 1/3(5 Building bricks are closely stacked in a pile 7 feet high,36 feet long and 12 feet wide.If the bricks are 2 inches by 4 inches by 9 inches,how many bricks in the pile?