Marco = m Troy = rm is 20 more than r m = r + 20B: r + 20
Boxers = b
Spaniels = s
Now you have two equations - one that tells you the number of boxers in relation to spaniels and one telling you the number of each breed in relation to the total number of dogs. Solve using substitution.
There are
6 spaniels.
easy, remember rules of exponents
the only one you need to know for this question is this one:
also
so in this case
answer is 1st option
9,374 rounded to the nearest thousands place is 9,000