An office supply store has five different packages of black ink pens. Which is the best deal available on black ink pens at this office supply? BLACK INK PEN PRICES
4 pack for $7.00
6 pack for $10.25
10 pack for $13.00
12 pack for $15.00
25 pack for $32.50
A) 4 pack for $7.00 B) 6 pack for $10.25 C) 10 pack for $13.00 D) 12 pack for $15.00

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

The mean of 10 values is 19. if further 5 values areincluded the mean becomes 20. what is the meanthese five additional values? a) 10b) 15c) 11d) 22

Need solving this 2nd limit problem.