Penny coins

One 2p coin is 1/8 inch thick. A pile of 2p is 1 1/2 inch high. How many coin are there in the pile

Correct answer:

n =  12

Step-by-step explanation:

p2=1/8=18=0.125 in p=112=1+12=1 2+12=32=1.5 in  n=p/p2=1.5/0.125=12

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