The cost of 2 watches and 2 lockets is rs. 10 800. What is the cost of 6 watches and 3 lockets
Answers
Let the cost of 1 watch be x rupees and that of a locket be y rupees.
Cost of 2 watches = 2x and Cost of 2 lockets = 2y _ (1)
According to first given case, the equation will be -
2x + 2y = 10,800
2 ( x+y ) = 10800
x + y = 10800 ÷ 2
x + y = 5400
For next equation we need to find value of 1 variable in terms of other.
So x = 5400 - y ( u can also take value of y in terms of x ) _ (2)
Similarly cost of 6 watches = 6x and cost of 3 lockets = 3y
According to next case , the equation is -
6x + 3y = 6 ( 5400 - y ) + 3y ( From (2) )
= 32400 - 6y +3y
= 32400 - 3y
3y = 32400
y = 1800 _ (3)
now putting value of y in (2) we get
x = 5400 - 1800
x = 3600 _ (4)
Putting value of x and y we get
6x + 3y = 6×3600 + 3×1800
= 21600 + 5400
= 27000
∴ Cost of 6 watches and 3 lockets is 27000 rupees
It's Not possible to determine! Because two variables and one equation are available.