[計量] Two tanks, X and Y, are filled ...
做練習遇到的幾題想不出來的問題...
拜託各位大大幫解~~ 謝謝 <(_ _)>
1. Two tanks, X and Y, are filled to capacity with jet fuel.
Tank X holds 600 gallons more than tank Y.
If 100 gallons of fuel were to be pumped from each tank,
tank X would then contain 3 times as much fuel as tank Y.
What is the total number of gallons of fuel in the two full tanks?
Ans: 1400
2. If the value if the expression above is to be halved by
doubling exactly one of the five numbers a,b,c,d, or e,
which should be double?
Ans: d
3. A part-time employee whose hourly wage was increased by
25 prescent decided to reduce the number of hours worked
per weeks so that the employee’s total weekly income would
remain unchanged. By what percent should the number of hours
worked be reduced?
Ans: 20%
4. For telephone calls between two particular cities, a telephone
company charges $0.40 per minute if the calls are placed
between 5:00 a.m. and 9:00 p.m. and $0.25 per minute if the c
alls are placed between the two cities placed at 1:00 p.m.
was $10.00, how much would a call of the same duration have cost
if it had been placed at 11:00 p.m.?
Ans: $6.25
5. If X and Y are sets of integers, X#Y denotes the set of integers
that belong to set X or set Y , but not both.
If X consists of 10 integers, Y consists of 18 integers,
and 6 of the integers are in both X and Y, then X#Y consists
if how many integers?
Ans: 16
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