The width of a US letter is 5×10−1 mm.
A pack of US letters have a width of 10m.
How many US letters are there in the pack?
20000
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Solution
The correct option is A 20000 The width of a US letter = 5×10−1mm.
A pack of US letters have a width of 10m.
You know, 1m=1000mm=10×10×10mm=101×101×101mm=101+1+1mm[∵ax×ay=ax+y]=103mm
Width of the pack of the US letters can be written as:10m=10×1m=10×103mm=101+3mm[∵ax×ay=ax+y]=104mm
∴ Number of US letters in the pack will be 1045×10−1=104−(−1)5=104+15[∵axay=ax−y]=1055=101+1+1+1+15=10×10×10×10×105=2×10×10×10×10=20,000
So, the number of US letters in the pack will be = 20000.