exam Maths Puzzle Numerical Ability

what is 4/11 * 7?
i dont know what do to here, and i have no clue how to muliply it.

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exam Other Question

solve:
2 x - y = 4
5x - y = 13 Ladder Height.
A 10-m ladder is leaning against a building. The bottom of the ladder is 5m from the builder. How high is the top of the ladder?