Ratio and Proportion

The ratio of prime numbers to composite numbers between $1$ and $10$ (excluding $1$) is:

Which ratio is greater, $1:2$ or $1:3$?

The ratio of $35$ to $105$ in simplest form is:

Ratio of $90$ minutes to $2$ hours is:

Amit has $36$ marbles and Sneha has $48$ marbles. If Amit gives $6$ of his marbles to Sneha, what is the ratio of the number of marbles Amit has now to the number of marbles Sneha has now?

If the ratio of the age of a father to his son is $5:2$ and the father is $40$ years old, how old is the son?

What is the ratio of $30$ cm to $1$ m?

The ratio of the number of working days to the number of holidays in a month of $30$ days, where every Sunday is a holiday and there are $4$ Sundays, is:

A recipe requires milk and water in the ratio $3:2$. If $1.5\text{ litres}$ of milk is used, how much water is needed?

If the ratio of the radii of two circles is $3:5$, what is the ratio of their circumferences?

In a proportion, the product of the extremes is equal to the:

If $4$ machines can produce $20$ parts, how many parts can $6$ machines produce?

Find the missing number: $7 : 14 :: \square : 28$.

Are $30, 40, 45, 60$ in proportion?

A worker earns $₹ 18,000$ in $3$ months. If he earns at the same rate, how much will he earn in $7$ months?

If $x : 1.2 = 5 : 2$, then $x$ is:

The weight of $8$ identical books is $2 \text{ kg}$. What is the weight of $20$ such books?

Two numbers are in the ratio $2 : 3$. If $5$ is added to each number, the ratio becomes $5 : 7$. Find the sum of the original numbers.

If $x, 2x+1, 10, 25$ are in proportion, find the value of $x$.

A machine makes $2400$ toys in $15$ hours. How many toys can it make in a full day ($24$ hours)?

If $4$ identical mats cost $₹1200$, what is the cost of $3$ mats?

If $7$ identical storybooks cost $₹1400$, find the price of $1$ storybook.

If $15$ identical candles cost $₹150$, find the cost of $3$ candles.

If $5$ identical towels cost $₹600$, find the cost of $1$ towel.

If $12$ erasers cost $₹60$, what is the cost of $25$ erasers?

If $3$ pairs of socks cost $₹150$, what is the cost of $10$ pairs of socks?

If $6$ candles cost $₹90$, what is the cost of $15$ such candles?

An office uses $48$ cartridges in $8$ months. How many cartridges will it require for $3$ years?

If $22.5$ meters of a uniform iron rod weighs $85.5$ kg, what will be the weight of $6$ meters of the same rod?

A bus consumes $25$ liters of diesel for a journey of $225$ km. How far can it go with $85$ liters of diesel?