Answer:
430
Step-by-step explanation:
<u>Given :-</u>
- By selling a watch on 400 and 460’. Loss and profit happened respectively.
- The loss and profit are equal.
And we need to find out the CP .So ,
<u>Let :- </u>
- CP be x
- Profit and Lost be y .
<u>According to the Question :- </u>
460 = x + y <em>( Profit)</em>
400 = x - y <em>( Loss)</em>
<u>Adding both :- </u>
460 + 400 = x + y + x - y
860 = 2x
x = 860/2
x = 430
<u>Hence the Cost price of the watch is 430 .</u>
We just have to multiply 20 by 10mm, which is 200mm. 100mm is equal to one centimeter, so the body length of the insect under the microscope is two centimeters.
To find your new number of sales per month, you will need to find the number of sales you have per month (based on 30 days per month).
55 x 20 = 1650 sales.
Than, you will need to calculate what 10% of this is and add it to your original sales number.
0.1 (10%) x 1650 = 165
1650 + 165 = 1815
You will need approximately 1815 sales based on the 30 day month.
The value of k is
<h3>How to solve the simultaneous equation?</h3>
Given:
x-y=k.............(eq i)
2x²+y²-15..............(eq ii)
We would make y the subject formula in eq ii
2x²+y²-15= 0
2x² + y²= 15
y²= 15-2x²
y=
...........(eq iii)
Substitute the value of y into eq i
x-(
= k
x- (
= k
k= 
Read more about simultaneous equations here:
brainly.com/question/16863577
#SPJ1
A if you multiply the divide the. Subtract the add the. Iudjnff