Four boys and three girls spent an average of ₹120, out of which the boys spent an average of ₹150. What is the average amount spent by the girls?

Four boys and three girls spent an average of ₹120, out of which the boys spent an average of ₹150. What is the average amount spent by the girls?
4 लड़के और 3 लड़कियों ने औसतन 120 रुपये खर्च किए, जिसमें से लड़कों ने औसतन 150 रुपये खर्च किए। तो लड़कियों द्वारा खर्च की गई औसत राशि है |