Based on the amount both have and the amount being saved per day, they will both have the same amount after 2 days.
Roger has $3 and is saving $1 per day. An equation to express the amount he would have after a n number of days is:
= Amount he already has + Amount saved per day x number of days
= 3 + 1n
For Elizabeth, this expression would be:
= 4 + 0.50n
Solve for n by equating both formulas:
3 + n = 4 + 0.5n
n - 0.5n = 4 - 3
0.5n = 1
n = 1/0.5
n = 2 days
In conclusion, they will have the same amount after 2 days.
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