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Mathematics for IGCSE & O level - Proportion (Section 1 - No. 40)

If *x* is directly proportional to *y*, and *x* = 10 when *y* = 2, find the value of *x* when *y* = 7.
5
35
40
70

Explicació

x = ky, 10=k*2, then k=5. Therefore, x = 5*7=35

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