book Maths Puzzle Numerical Ability

when Y=6


5y or y+19

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book Other Question

R = (0.75V/pie)^3
Where V is it’s volume, find the radius of a spherical tank that has a volume of 32 pie/3 cubic meters
I am a mom trying to help my son with a word problem. I am stumped. Please help:
Pete has 20 pets. If he has 5 more than 1/4 as many dogs as cats, how many cats does he have?
Thanks!
LS