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Mathematics for IGCSE & O level - Proportion (Section 1 - No. 45)

If *y* varies jointly as *x* and *z*, and *y* = 20 when *x* = 2 and *z* = 5, find *y* when *x* = 3 and *z* = 4.
12
24
30
36

説明

y=kxz. 20=k*2*5; k=2. y=2*3*4=24

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