Let x be the salary.

Then if he SPENDS (2/3)x on rent and food then the remaining salary is x/3,

Out of which he spends 1/4 i.e(x/3)1/4 or x/12 on TRANSPORTATION...and the amount left thereafter is : ( x/3 ) - ( x/12 ) = x/4

Given..the amount left with Rajesh is : 6000 = x/4

=> Salary of Rajesh 'x' is : 6000 * 4 = Rs.24,000

Amount SPENT on rent and food = 24000 * (2/3) = Rs.16,000

Remaining amount : 24000 - 16000 = Rs.8000

Amount spent on transportation : 8000 * (1/4) = Rs.2000

Remaining amount : 8000 - 2000 = Rs.6000,the amount left with Rajesh

So ANSWER is : 2000

Let x be the salary.

Then if he spends (2/3)x on rent and food then the remaining salary is x/3,

Out of which he spends 1/4 i.e(x/3)1/4 or x/12 on transportation...and the amount left thereafter is : ( x/3 ) - ( x/12 ) = x/4

Given..the amount left with Rajesh is : 6000 = x/4

=> Salary of Rajesh 'x' is : 6000 * 4 = Rs.24,000

Amount spent on rent and food = 24000 * (2/3) = Rs.16,000

Remaining amount : 24000 - 16000 = Rs.8000

Amount spent on transportation : 8000 * (1/4) = Rs.2000

Remaining amount : 8000 - 2000 = Rs.6000,the amount left with Rajesh

So answer is : 2000