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24 February, 20:05

The quantity y varies directly as x and inversely as z. when x is 10 and z is 4, y is 15. what is y when x is 20 and z is 6? 1) 6 2) 20 3) 27 4) 30

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  1. 24 February, 20:25
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    Hello,

    y=k*x/z if x=10 and z=4 then y=15

    ==>15=k*10/4==>k=60/10==>k=6

    Answer A
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