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Mathematics for IGCSE & O level - Proportion (Section 1 - No. 10)

If *a* is directly proportional to *b* and *a* is 10 when *b* is 2, what is the value of *a* when *b* = 5?
4
10
25
50

설명

a = kb; 10= k*2; k=5; so a =5b; Therefore if b is 5, a is 25.

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