Three numbers are in a ratio 5 : 7: 9. If the difference between the largest and the smallest number is 20, find the middle number.
Show answer & explanation
Correct answer: B
Explanation
Given:
Ratio of three numbers = 5 : 7 : 9
Difference between the largest and smallest number = 20
Formula:
Numbers = 5x, 7x, 9x
Largest − smallest = 9x − 5x = 4x
4x = 20
x = 5
Middle number = 7x = 7 × 5 = 35