Mathematics for IGCSE & O level - Proportion (Section 2 - No. 15)

If *x* varies directly as *y* and *x* = 15 when *y* = 3, find *x* when *y* = 7.

21

35

40

45

解释

x=ky, 15=3k, k=5. Therefore x=5*7=35

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