A photocopier enlarges a picture in the ratio 7:4. How many times will a picture of size 6cm by 4cm be enlarged to fit on a 30cm by 20 cm page?

Correct result:

n =  2.876


a1=6 cm a2=30 cm k=7/4=74=1.75 a2=kn a1 a2/a1=kn n=log(a2/a1)/log(k)=log(30/6)/log(1.75)=2.876

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