Question 55633
A grain-storage warehouse has a total of 30 bins. Some hold 20 tons of grain each ( T SAY), and the rest hold 15 tons each( F SAY ). How many of each type of bin are there if the capacity of the warehouse is 510 bins?
T+F = 30..................1
CAPACITY OF TWENTY TON BINS = 20T
CAPACITY OF FIFTEEN TON BINS = 15F
TOTAL = 20T+15F = 510..OR.....4T+3F=102....................2
3*EQN1-EQN.2 GIVES
3T+3F-4T-3F=3*30-102=90-102=-12
-T=-12
T=12
F=30-12=18