Marias penny bank is 1/2 full. after she removes 120 pennies, it is 1/3 full. how many pennies can marias bank hold

720 pennies

Step-by-step explanation:

The difference between the  fraction originally contained  in the bank (1/2) and the fraction that remains  after Maria removes 120 pennies (1/3) represents the fraction occupied by the 120 pennies.

Therefore the fraction occupied by the 120 pennies= 1/2-1/3=1/6

thus if 1/6 of the bank can hold  120 pennies, then, when full it holds 120×6/1=720 pennies

i did it myself and i got 4.2 (b) hope its right

step-by-step explanation:

correct answer:

b.(19,-2)