15x - 8 = 14x + 13
x - 8 = 13
x = 21
Jenny's total earnings:
total earnings = (hours worked on design)*40 + (hours worked on maintenance)*35
average earnings = total earnings / hours worked
So far she has
total earnings = 18*40 + 20*35 = $1420
which is an average per hour = $1420/38hr = $37.37
How many more hours on webdesign: x
so that
($1420+x*$40)/(38+x)=38
Now solve for x - this I let you do. My results is x=12 (you can verify by plugging it iback into the equation).
The answer is Jenny needs to work 12 more hours to claim an average earnings of $38/hr. Lmk if you have questions.
39=5*pen+4 => 5*pen=39-4=35 => pen=35/5 => pen=7. Each pen costs $7 .
The 1st sequence is not but the 2nd one is and the common difference here is 4
23.60/5 = $4.72 per bag
32.76/7 = $4.68 per bag
so 7 bags of apples for $32.76