3/4 of the lot is 3/4*100=75 yards long. This is 75*3=225 feet.
Find out how many children there are first. Come on, this is simple fractions/percents/decimals/ratios.
Answer:

This is because modulus number will be always positive
Hope this is correct and helpful
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Sphere surface area is A=4pi*r^2. So r is sqrt(A/4pi)
r=4cm. So d=8cm