You're caring for three children in your home: a three-year-old, a four-year-old, and a two-month-old infant. the infant often becomes hungry and wants to be fed just when you're involved in something with the two older children. what should you do with the infant?
a. put the infant in a location so he or she can watch you and the other two children; then feed the infant when you're through.
b. hold and feed the infant while you supervise the activity of the older children.
c. have the older two children continue the project on their own while you feed the infant in a separate room.
d. prop the infant's bottle in the crib so he or she can eat while you continue to the older children

B. Hold and feed the infant while you supervise the activity of the older children.

Explanation: On one side, a two-month-old is too young to understand that he has to wait until you finish with your other activities so you are free to feed him. His needs are urgent. Of course he is also too young to take the bottle on his own. These are the reason why options A and D are incorrect. On the other side, the other two children also need your supervision. You have to take care of them and leave them alone is not a good option. This is why option C is incorrect. Taking all these things into account I find option B as the best answer.

powerful computers now, not then

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form