Question

There are 3 notes of Rs. 100, 3 notes of Rs. 50, 2 notes of Rs. 10, 5 notes of Rs. 5 And k  notes of Rs. 2. If three different amounts i.e. Rs.173, Rs. 69 and Rs.267 are to be paid from these, what is the minimum value of k ?

Answer 1

there are three notes of 100 rs therefore total rs. =300 rs
there are 3 notes of rs 50 therefore total rs. =150
there are 2 notes of rs 10 therefore total rs =20 rs
there are 5 notes of rs5 therefore total rs = 25 rs
there are k notes rs 2 therefore total rs =2k rs
three different amounts are Rs. 173, Rs. 69, Rs. 267
total amount = 173+69+267
300+150+20+25+2k=509
495+2k=509
2k=14
k=7 ans......... 

Answer 2

amount to be paid = 509
total amount = 495+2(k)
on solving 
k=7