A collection of marbles is set up into 5 rows. The first row has 125 marbles, and each row after that one has 4 less marbles than the preceding row.

Question

How many total marbles are there in the 3rd row?

a.)115 b.)120 c.)113 d.)117

Answer 1

125 row 1 (4 less in each preceding row)

121 row 2

117 row 3

d.) 117