1. The total cost of 2 pencils, 5 erasers, and 7 sharpeners is Rs.30, while 3 pencils and 5 sharpeners cost Rs. 15 more than 6 erasers. By what amount (in Rs.) does the cost of 39 erasers and 1 sharpener exceed the cost of 6 pencils?

(1) 20

(2) 30

(3) It does not exceed

(4) Cannot be determined

from the qn
eq 1 is 2p+5e+7s=30
eq 2 is 3p-6e+5s=15
eq 3 is 39e+S=6p+?

so here we have to multiply the first 2 equations with such a number that we get 3rd equation so multiply 1st eq with 3 and 2nd eq with 4 and subtract both the resultant equations to arrive at -6p+39e+s=30 so 39e+s=6p+30
so the answer is 30