Arithmetic

Ratio, Proportion & Variation

Easy

The ratio between two numbers is 3:7 and their LCM is 210. The first number is

✅ Correct Option: 2

Let the numbers be $3k$ and $7k$ . Since 3 and 7 are coprime, their LCM is $21k$ .

So $21k = 210$ , giving $k = 10$ .

The first number is $3k = 30$ (the second is 70).

2026: 6 June Shift 1

If 6A = 14B then the ratio of $\frac{A}{7}$ to $\frac{B}{6}$ is:

2022: 23 Aug Shift 1

What is the overall percentage of marks obtained by GP in all subjects?

2022: 24 Aug Shift 1

If A : B = 4 : 5, B : C = 4 : 15 and C : D = 5 : 16 Than find the ratio between A and D :

2022: 8 Aug Shift 1

What is the value of x if $4 : x = x : 16$ ________?

2022: 23 Aug Shift 1

What is the ratio between total marks obtained in all subjects by RP and FA?

2025: 15 May Shift 1

If in a class, 10 % of the girls are equal to one-fourth of the boys in the school, then the ratio of girls to the boys in the school is?

Solution