Home Questions Mathematics Questions There are 120 students in a picnic tour, if ratio of girls and boys is 5 : 7 then how many boys are in this tour?
Question:

There are 120 students in a picnic tour, if ratio of girls and boys is 5 : 7 then how many boys are in this tour?

Choose the correct answer:
  • A. 50
  • B. 70 ✅ Correct
  • C. 55
  • D. 120
Explanation:
Given ratio of  girls : boys   = 5 : 7 = 5/7
multiplying the antecedent and consequent by the same number, let by x,
girls = 5x, and boys = 7x 
total  = 120;
as par given 5x + 7x = 120
=> x = 120/12 = 10
hence, girls  = 5 × 10 = 50 
and Boys = 7 × 10 = 70  answer

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