rntndnzn1
Oct 14, 2009, 04:11 PM
Henry's bus can go just 12 miles on a gallon of gasoline. When he started his vacation, the gas tank of the bus was 5/6 full. Later when Henry had driven 336 miles, the gauge showed that the tank was still 3/5 full. If his "low on gas" light will come on when he has 1/15 of a tank remaining, how much farther can he go before seeing that light?
x/336 = (3/5 - 1/15)/(5/6 - 3/5)
x/336 = (8/15)/(7/30)
x/336 = 16/7
x = 336(16/7) = 768 miles
Is this right?
or
Is this right?
7/30 of the tank was spent going 336
miles. So the full tank should be able to provide 30/7 * 336 or 1440
miles.(It's a big tank). So 14/15 of the tank should take him 14/15 *
1440 miles = 1344 miles. Since he's already gone 336 miles, he has
1344-336 = 1008 miles to go.
Can you please tell me why which one is correct?
Thanks
x/336 = (3/5 - 1/15)/(5/6 - 3/5)
x/336 = (8/15)/(7/30)
x/336 = 16/7
x = 336(16/7) = 768 miles
Is this right?
or
Is this right?
7/30 of the tank was spent going 336
miles. So the full tank should be able to provide 30/7 * 336 or 1440
miles.(It's a big tank). So 14/15 of the tank should take him 14/15 *
1440 miles = 1344 miles. Since he's already gone 336 miles, he has
1344-336 = 1008 miles to go.
Can you please tell me why which one is correct?
Thanks