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Multiplication Trick for a Table

If 4: 5:: x: ...

Question

If 4 : 5 : : x : 35, then the value of x is
(a) 42
(b) 32
(c) 28
(d) none of these

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Solution

(c) 28
4:5::x:35
⇒ 4 = x
5 35
⇒ x = 4 × 35 = 4 × 7 = 28
5

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