Mathematics for IGCSE & O level - Proportion (Section 3 - No. 27)

If y varies directly with x, and y=10 when x=5, what is y when x=15?

5

10

20

30

Paaiškinimas

y=kx. 10=k5, and k=2. y=2x and, thus, y=2*15=30.

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