exam Maths Puzzle Numerical Ability

Please help me solve this word problem:

A ladder is resting against a wall. The top of the ladder touches the wall at a height of 18 feet. Find the length of the ladder if the length is 6 feet more than its distance from the wall.

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Can you please help me with this i do not understand it.

Solve using the square root property

5x^2 = 100

thank you
julie sheila and tim collect used telephone cards.sheila has three times as many as tim.if sheila gave tim six of her cards,she would have only twice as many as tim.how many cards does e