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## karatechopper 3 years ago This is for a friend:) If anyone could help I would appreciate lots! Write a word problem that can be solved by working backward. Include at least two steps in the problem. Then, show the answer and how the problem can be solved by working backward.

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1. karatechopper

You all don't have to show the answer or how it is solved. I can do that. I just need help in figuring out a word problem that will be solved backwards?

2. rebeccaskell94

D: Someone asked me the same question. boohoo I found this on google xD Carli filled her tank full with gas. She used half her gas to go to school, then 5 gallons going to work, and the last 3 gallons just driving around. How much can her tank hold? answer is 16 gallons

3. karatechopper

OMG thanks so much becccss!!

4. karatechopper

ok now.. @Vivi305 u here?

5. rebeccaskell94

lol love me some yahoo! answers xD

6. Vivi305

yes i am here

7. TheViper

umm... Equation is:-$\Huge{\color{green}{\frac{x}{2}-5-3=0}}$

8. TheViper

Correct?

9. TheViper

x=no. of gallons

10. rebeccaskell94

There is always option B xD A scientist has a special bacteria that when he places a batch in a beaker, can double in volume every minute. He puts a few of the bacteria in a beaker. In an hour, the beaker is full. When was it 1/4 full? Working backwards, it must have been 1/2 full at 59 minutes, because in the 60th minute it doubled in volume. Similarly, it must have been 1/4 full at 58 minutes.

11. karatechopper

lol @vivi305 should know

12. TheViper

it took so much time @karatechopper :D

13. rebeccaskell94

lol

14. karatechopper

Lol but its not my question!

15. rebeccaskell94

xD

16. TheViper

hmm.... I think it's @Vivi305 's question :O

17. rebeccaskell94

lol you think? xD

18. karatechopper

It is!

19. TheViper

xD

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