one rupee coin be z
50 paisa coins=2z
25 paisa coins=4z
50/25=2 2z*2=4z
z+2x+4x=175
7z=175
7z/7=175/7
z=25
one rupee coin=25 value
50 paisa rupee coins=50 value
25 rupee coin=100 value
50/25=2 50*2=100
25+50+100=175
Answer is b) Rs 175. I think this is the answer.