can i lose 20 pounds and gain a nice 6 pack doing this????

145 pounds
5’6
goal weight: 120-125
IN A MONTH

EXERCISE::::::
–everyday i do 45min-1hour on the elliptical
i do an ab workout consisting of different kinds of cruches and it adds up to a total of about 500.

–monday wednesday and friday i play volley ball and we have workouts where we lift weights for a little bit and run about 1/2 to 1 mile..

–also do other moderate exercise such as cheerleading, and some tennis…………….dont really count it though

DIET:::::::::::

i eat sugar free jello alot mainly my breakfast and lunch..its only 40 calories per box.

then i either eat a subway sandwich or a peice of chicken/fish with vegetable for dinner

i only drink water

Ive limited my calories to 500..i know its not very much but im really serious about losing this weight and i don’t care

HOW LONG WILL IT TAKE TO LOSE MY 20 POUNDS AND WILL I GET A SIX PACK…WHAT CAN I DO ALSO TO HELP GAIN THE SIX PACK… thanks