17. The areas of the two rectangles in the diagram are 25 cm² and 13 cm² as indicated.

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What is the value of x?

18. Between them, the two five-digit integers M and N contain all ten digits from 0 to 9.

‍What is the least possible difference between M and N?

20. A drawer contains ten identical yellow socks, eight identical blue socks and four identical pink socks.

Amrita picks socks from the drawer without looking.

What is the smallest number of socks she must pick to be sure that she has at least two pairs of matching socks?

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21. There are ______ vowels in this short sentence.

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Which of the following options should replace “_______” to make the sentence in the box true?

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22. In the triangles PQR and STU, In the triangles PQR and STU, ∠RPQ = 2 × ∠UST, ∠PRQ = 2 × ∠SUT and ∠RQP = $\frac{1}{5}$ × ∠ U T S .

How large is ∠UT S?

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23. Ali wants to fill the empty squares so that the number in each square after the fourth from the left is the sum of the numbers in the four squares to its left.

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What number should Ali write in the final square?

24. The shapes P and Q are formed from two and three identical rectangles, respectively. Their perimeters are 58 cm and 85 cm respectively.

What is the perimeter of one of the rectangles?

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25. In the diagram PQ and QR are sides of a regular n-sided polygon, ∠SPQ = ∠SRQ = 80°, ∠PTR = 70° and PT = ST = RT.

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What is the value of n?

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