exam Maths Puzzle Numerical Ability

The sum of three numbers is 8. Twice the smallest is 2 less than the largest, and the sum of the largest and smalles is 5. Use linear system in three variables to find the three numbers.

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exam Other Question

The amount of water used to take a shower is directly proportional to the amount of time that the shower is in use. A shower lasting 23 minutes requires 4.6 gallons of water. Find the amount of water used in a shower lasting 4 minutes.
FIND THE DISTANCE BETWEEN THE POINTS A(4,-3) AND B(-4,3).