Quantitative Aptitude - MCQ Practice Questions

HCF × LCM = Product of numbers = 360. 360 = 20 × other number.

Other number = 360 ÷ 20 = 18.

Using HCF × LCM = Product: 6 × 60 = 12 × other. 360 = 12 × other.

Other = 360 ÷ 12 = 30.

Using the formula: HCF × LCM = Product of two numbers

12 × 180 = 60 × Other number

2160 = 60 × Other number

Other number = 2160 ÷ 60 = 36

Verification: HCF(60, 36) = 12 ✓ and LCM(60, 36) = 180 ✓

Using HCF × LCM = Product of two numbers:

15 × 450 = 90 × Other number

6750 = 90 × Other number

Other number = 6750 ÷ 90 = 75

Verification: HCF(90, 75) = 15 ✓ and LCM(90, 75) = 450 ✓

Profit=50. Profit%=($\frac{50}{200}$)×100=25%.

Speed=Distance/Time=$\frac{360}{4}$=90 km/hr.

SI=(P×R×T)/100=(5000×8×3)/100=Rs 1200.

15% of 480=($\frac{15}{100}$)×480=72.

Larger=($\frac{5}{8}$)×64=40.

LCM of 12,18,24=72.

x=90×$\frac{100}{30}$=300.

HCF=12.

4x=20, x=5.

n(n+1)/2=20×$\frac{21}{2}$=210.

Area=12×8=96 sq m.

x=12×$\frac{4}{3}$=16.

Savings=40% of 15000=Rs 6000.

Find HCF of 48 and 64 using Euclidean algorithm: 64 = 48 × 1 + 16; 48 = 16 × 3 + 0. Therefore, HCF = 16.

12 = 2² × 3; 18 = 2 × 3². LCM = 2² × 3² = 4 × 9 = 36.

61 is only divisible by 1 and itself. 51 = 3 × 17, 57 = 3 × 19, 63 = 9 × 7 are composite numbers.