If a : b = 5 : 4 and b : c = 3 : 4, then what is a : c?

The ratio of the four numbers is 2 : 3: 4: 5. If their sum is 70, what is the sum of the first and fourth number?

Sum of two numbers is 80, and their difference is 8. Which of the following can be the ratio of two numbers?

If $x=\frac{3}{5}y$ and $y=\frac{2}{3}z$, then find x: y: z.

The forth proportional to 18, 15, 12 is:

Sum of three numbers is 48. The ratio of the first number to second is 3: 4 and that of the second to the third is 4: 5. Find 2^nd number.

The monthly salaries of two persons A and B are in the ratio of 3 : 5 respectively. If both of them received an increment of Rs 250, then the ratio becomes 2 : 3. What were their respective salaries before the increment?

If a : b = b : c, then a⁶ : b⁶ is equal to

If P: Q: r = 3: 4: 5, then find the value of $\sqrt{2(p^2+q^2+r^2)}$.

The mean proportional between 4 and 8 is:

Two numbers are in ratio 4: 5. If 2 is added to the first and 2 is subtracted from the second the ratio becomes 10: 11. Find the sum of numbers.

Three persons, X, Y and Z walk from place A to B. Their speeds are in ratio 2: 4: 5. If the distance between A and B is 5 km, the ratio of the time taken by them to reach B will be:

If a: b = 4: 5, find the value of $\frac{5a-2b}{5a+2b}$.

Find third proportional of 0.9 and 1.2

Ratio of milk and water in a container containing 100 liters of the mixture is 3: 1. After the addition of some more milk into it, the ratio becomes 4: 1. Find the quantity of milk added.