Multiple choice

The present ratio of ages of A and B is 4:5 . 18 years ago, this ratio was 11:16. Find the total age of their present age? A और B की वर्तमान आय का अनुपात 4:5 है. 18 वर्ष पूर्व यह अनुपात 11:16 था.वर्तमान आयु का कुल योग ज्ञात कीजिये?

  1. 90

  2. 80

  3. 105

  4. 110

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let present ages be 4x and 5x. 18 years ago, ages were (4x-18) and (5x-18), with ratio 11:16. So (4x-18)/(5x-18) = 11/16. Cross-multiply: 16(4x-18) = 11(5x-18), giving 64x - 288 = 55x - 198. So 9x = 90, x = 10. Present ages are 40 and 50, total = 90.