• 42
• 55
• 50
• 60

Answer: 50
Explanation:Given, ratio is 5 : 1 that means antecedent is 5 times greater than the consequent.
Given consequent =  10, so the number is 10 ×  5  =  50 answer.

• 50
• 70
• 55
• 120

Answer: 70
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