# Electronic bank teller question

• Jan 31st 2011, 03:55 PM
mandarep
Electronic bank teller question
An electronic bank teller registered \$775 after it had counted 120 notes and \$975 after it had counted 160 notes.
Find a formula for the sum registered, in terms of the number of notes counted.
Was there a sum already on the register when counting began?
If so, how much?
• Jan 31st 2011, 04:18 PM
harish21
Let Y = sum registered

N = Number of notes counted

a = value of notes

S= sum in the register when counting began...

$775 = 120a+s$

$975=160a+s$

then.....
• Jan 31st 2011, 04:31 PM
grooverandshaker
Thanks so much.
I had this question in my worksheet as well.
I ended up getting it right. :)
• Feb 1st 2011, 03:06 PM
mandarep
Thanks for all of your help.