Answers

2014-10-14T21:52:46+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Let cost of each orange = Rs. x
     cost of each banana = Rs. y
Cost of 20 oranges and 30 bananas = 20x+30y
So 20x+30y = 280
2x + 3y = 28

if cost of each orange is doubles, cost of each orange = 2x
cost of 30 oranges and 40 bananas = 30(2x) + 40y  = 60x+40y
thus 60x+40y = 540
6x + 4y = 54

Solving the two equations we get, x = 5 and y = 6.
 So cost of each orange = Rs. 5.
0
2014-10-15T11:26:52+05:30
Let the cost of each orange be Rs x
Cost of each banana = Rs y

Cost of 20 oranges and 30 bananas = 280
⇒20x+30y = 280
Dividing both sides by 10
⇒ 2x + 3y = 28 ........(1)

Cost of each orange is doubled.
Now, cost of orange = Rs 2x
Cost of 30 oranges and 40 bananas is Rs 540
60x + 40y = 540
Dividing both sides by 20
3x + 2y = 27 .......(2)

Multiply eq (1) by 2 and eq(2) by 3

4x + 6y = 56
9x + 6y = 81         (Subtract)
-----------------         
 -5x = - 25

x = 5

Cost of each organge = Rs 5
0