2017 · Q42
There are 350 boys in the first three standards. The ratio of the number of boys in first and second standards is 2 : 3, while that of boys in second and third standards is 4 : 5. What is the total number of boys in first and third standards ?
Elementary MathematicsRatio and Proportion
- A302
- B280
- C242
- D230
Explanation
First:second = 2:3 and second:third = 4:5. Taking the second standard as 12 units: first = 8, second = 12, third = 15, total 35 units = 350, so 1 unit = 10. First+third = 23 units = 230. Hence option (D) 230.