package of floor tiles contains 30 one-foot-square tiles. Find how many packages should be bought to cover a square ballroom floor whose side measures 68 feet. Note: Partial packages cannot be bought.

155 packages

Step-by-step explanation:

68 times 68 (need to find the area of the square)

4625 divided by 30 (figure out how many time it can go into the area)

equals 154.13333 (but no partial boxes)

155

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%

so, converting firstly the mixed fractions to improper fractions and then "adding".