Answer:
Solution given:
model A printers [a] prints=80books per day
model B printers [b] prints=55books per day
total no of printers =9
no of model A printers be x
and
no of model B printers be [9-x]
According to the question;
ax+(9-x)b=670 books
substituting value of a and b; we get
80x+(9-x)55=670
80x-55x+495=670
25x=670-495=175
x=
=7
So;
no of model A printers =x=<u>7</u>
no of model B printers =9-x=9-7=<u>2</u>
<u>is</u><u> </u><u>your</u><u> </u><u>answer</u><u>.</u>
Answer:
ok so 3-1.7=1.3
Step-by-step explanation:
this is bc 3-1=2-0.7=1.3
1.
<span><span>time she spent walking = T
</span><span>
</span></span>
time she spent jogging = 1.2 - T
<span>
<span>
</span></span>
<span><span>2T + 4(1.2 - T) = 3.4
</span><span>
</span></span>
<span><span>2T + 4.8 - 4T = 3.4
</span><span>
</span></span>
<span><span>2T - 4T = 3.4 - 4.8
</span><span>
</span></span>
- 2T = - 1.4
T = -1.4—2 = 0.7 hours = 42 minutes
Time she spent jogging = 1.2-0.7 = 0.5 hours = 30 minutes
2.
Against wind :2400 miles in 10 hours
With wind : 2400 miles in 8 hours
Speed of plane = x
Speed of wind = y
t=d/r
against the wind speed x-y mph
with the wind x=y mph
2400/(x-y)=10
2400 = 10x-10y
240 =x-y eq.1
2400/x+y=8
2400 = 8x+8y
300 = x+y eq 2
Add eq1 & eq 2 = 740 = 2x
X = 740/2 = 370 mph for plane
300 = 370 +y
Y = 370-300 = 70 mph wind speed
What are the answer choices?
but in my head, I would see substitution as the answer but like I said it would depend on the answer choices
