A man buys Rs.7 apples. When after a few days the price of the apple goes down by Rs.2, he buys 6 more apples.
Both the amounts were in whole numbers, were two digits and has the same digits.
Find how many apples could be bought for Rs.144.
The equations I could find was :
i) 10a + b = 7x ii) 10b + a = 6(x-2)
- x : cost/apple for trans a
- x-2 : cost/apple for trans b
- 10a+b : trans a total
- 10b+a : trans b total
There are three variables, how do I derive the third equation ?