Shadow proportional to height: find the other height or shadow

The same question, asked 2 times: 20 Jul 2023 S4*, 26 Jul 2023 S3. Every wording below, oldest first.

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Question 1
20 Jul 2023 S4
66 $A vertical pole of 28m height casts a 19.2m long shadow. At the same time, find the length of the shadow cast by another pole of 52.5m height.$
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Question 2
26 Jul 2023 S3
51 $If a 7-storey building has a 28 m long shadow, the number of storeys of the building whose shadow is 48 m long is:$
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