Question 266425
f+t=138 or f=138-t
5(138-t)+10t=1015
690-5t+10t=1015
5t=1015-690
5t=325
t=325/5
t=65 ten dollar bills.
f=138-65=73 ten dollar bills.
Proof:
5*73+10*65=1015
365+650=1015
1015=1015