MHB How many days does it take to save $60 with a pattern of earning and spending?

[burgess]

Help required to solve my math home work

A man earns \$20 on first day and spends \$15 on next day, again earns \$20 on third day and spends \$15 on fourth day. If he continues to save like this, how soon he will have \$60 on his hand?

Thanks in advance

 

[kaliprasad]

Help required to solve my math home work

A man earns 20$ on first day and spends 15$ on next day, again earns 20$ on third day and spends 15$ on fourth day. If he continues to save like this, how soon he will have 60$ on his hand?

Thanks in advance

For every 2 days he makes 20 and spends 5 so he has 15

so after 16 days he shall have 40

on the 17th day he gets 20 so he shall have 60

 

[SuperSonic4]

Help required to solve my math home work

A man earns 20\$ on first day and spends 15\$ on next day, again earns 20$ on third day and spends 15\$ on fourth day. If he continues to save like this, how soon he will have 60\$ on his hand?

Thanks in advance

Consider day 1 and day 2:

day 1: [math]+20\$[/math]

day 2: [math]-15\$[/math]

Thus by the end of day 2 he has $$20-15 = \$5$$ saved.

To find the amount of periods (which are 2 days remember) divide 60 by 5.

Also a note on LaTeX: If you put a backslash (\) before a dollar sign it escapes it so the board does not consider it to be LaTeX - Quote this post to see how I've done it.

 

[MarkFL]

Help required to solve my math home work

A man earns \$20 on first day and spends \$15 on next day, again earns \$20 on third day and spends \$15 on fourth day. If he continues to save like this, how soon he will have \$60 on his hand?

Thanks in advance

In order for our helpers to most effectively provide help to you, we ask that you show what you have tried and where you are stuck. This way we can see what you may be doing wrong and explain why it doesn't work. :D

 

[burgess]

Thank you all for your replies

 

[timjackson86]

Answer is 17 days I think, because on 16 days he/she has 40 and on next one day he has 20 extra, so it becomes 60 in 17 days.

-Tim
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