BBA-DBE Bangalore Algebra > Linear Equation PYQs

If $x - 2y + 4z = 6$, $3x + y + 5z = 4$ and $2x - y + 3z = 4$, then what is the value of $(2x – 3y + 5z)$?

Ravish paid ₹640 for a jar of 40 chocolates where the amount paid included the cost of the jar. Harish paid a total of ₹1540 for one jar containing 55 chocolates and a second jar containing 45 chocolates, where the amount paid included the cost of both the jars. If all jars cost the same, and all chocolates cost the same, how much (in ₹) would Satish have to pay for a jar containing 35 chocolates, if the amount he has to pay includes the cost of the jar as well as that of the chocolates he bought?