Elimination Method of Finding Solution of a Pair of Linear Equations
The coach of ...
Question
The coach of a cricket team buys 7 bats and 6 balls for 3800. Later she buys 3 bats and 5 balls for 1750. Find the cost of each bat and each ball.
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Solution
Let cost of each bat = Rs x Cost of each ball = Rs y Given that coach of a cricket team buys 7 bats and 6 balls for Rs 3800. So that 7x + 6y = 3800 6y = 3800 – 7x Divide by 6 we get y = (3800 – 7x) /6 … (1) Given that she buys 3 bats and 5 balls for Rs 1750.so that 3x + 5y = 1750 Plug the value of y 3x + 5 ((3800 – 7x) /6) = 1750 Multiply by 6 we get 18 x + 19000 – 35 x = 10500 -17x =10500 - 19000 -17x = -8500 x = - 8500 / - 17 x = 500 Plug this value in equation first we get y = ( 3800 – 7 * 500) / 6 y = 300/6 y = 50 HENCE THE COST OF EACH BAT = Rs.500 and the cost of each ball is Rs.50