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Mathematics for IGCSE & O level - Proportion (Section 2 - No. 29)

If *y* is directly proportional to *x* and *y* = 10 when *x* = 5, what is the value of *y* when *x* = 8?
4
13
16
20

Explicaţie

Since y = kx and 10 = k*5, then k=2. If x=8, y=2*8 = 16

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