Ratios MCQs set 2 for ISSB - Pak Army Officer Selection Mathematics — 20 solved questions.
Q1. Mix ratio 2:3 costs. Total 50 liters. First part:
Answer: 20
Explanation: Total parts are 5. One part is 10. First part is 20 liters.
Q2. If A:B = 1:2 and B:C = 3:4, A:C is:
Answer: 3:8
Explanation: Make B common: A:B = 3:6 and B:C = 6:8. So A:C = 3:8.
Q3. Divide 120 in 1:2:3. Largest share:
Answer: 60
Explanation: Total parts are 6. One part is 20. Largest is 3 times 20, which is 60.
Q4. Ratio 4:6, sum 50. Smaller:
Answer: 20
Explanation: Simplify to 2:3. Total parts 5. One part is 10. Smaller is 20.
Q5. Mix 2:3:5 total 100 L. Middle part:
Answer: 30
Explanation: Total parts are 10. One part is 10. Middle is 3 times 10, which is 30.
Q6. If 5:x = 15:21, x is:
Answer: 7
Explanation: Cross multiply: 5 times 21 equals 15x, so 105 equals 15x and x is 7.
Q7. Ratio 7:3, difference 20. Larger:
Answer: 35
Explanation: Difference of parts is 4. One part is 5. Larger is 7 times 5, which is 35.
Q8. Ratio of 2:3 equals which fraction?
Answer: 2/5
Explanation: In ratio 2:3 the first part is 2 out of total 5 parts.
Q9. Divide 120 in ratio 2:3. Larger share?
Answer: 72
Explanation: Total parts 5 so larger share is 3/5 of 120 which is 72.
Q10. Simplify ratio 45:60.
Answer: 3:4
Explanation: Divide both by 15 to get 3:4. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q11. Map scale 1:50000. 3 cm on map equals?
Answer: 1.5 km
Explanation: Three cm times 50000 cm equals 150000 cm which is 1.5 km.
Q12. Ratio of boys to girls is 5:4. If boys are 25, girls?
Answer: 20
Explanation: Five parts equal 25 so one part is 5 and four parts is 20 girls.
Q13. If a:b = 3:2 and b:c = 4:5, then a:c?
Answer: 6:5
Explanation: Make b equal: a:b:c = 6:4:5 so a:c is 6:5. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q14. Ratio 3:5, total 40. Smaller part?
Answer: 15
Explanation: Three eighths of 40 equals 15 for the smaller share. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q15. Divide 90 in ratio 1:2. Larger share?
Answer: 60
Explanation: Two thirds of 90 equals 60 for the larger part. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q16. Simplify 18:24.
Answer: 3:4
Explanation: Divide both by 6 to get 3:4. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q17. If 2:3 = x:15, x equals?
Answer: 10
Explanation: Cross multiply 3x equals 30 so x is 10. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q18. Age ratio 4:5, sum 36. Younger age?
Answer: 16
Explanation: Four ninths of 36 equals 16 years. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q19. Coins ratio 2:3 worth 50 rs if 2rs and 1rs coins. Count of 2rs?
Answer: 10
Explanation: Solve 2x plus 3x equals 50 with x=10 for 2rs coins count.
Q20. Ratio 4:7, sum of parts 55. Larger part?
Answer: 35
Explanation: Eleven parts equal 55 so one part is 5 and seven parts is 35.