# A gulab jamun contains sugar syrup up to about 30% of its volume. Find approximately how much syrup should be found in 45 gulab jamuns, each shaped like a cylinder with two hemispherical ends with a length of 5 cm and a diameter of 2.8 cm as shown in the below figure.

A cylinder shape in mathematics is a three-dimensional solid figure which consists of two circular bases connected with two parallel lines.

### Answer: The quantity of sugar syrup in 45 gulab jamuns will be 338.202 cm^{3}.

A hemisphere is a three-dimensional shape that is half of the sphere. When a sphere is cut by a plane passing through its center, the shape we get is called the hemisphere. The volume of a hemisphere of some radius can be easily found out by calculating just half of the volume of a sphere of the same radius.

**Explanation:**

The diameter of the cylinder = 2.8 cm

Thus, the radius = Diameter/2

= 2.8/2

= 1.4 cm

Radius of the hemisphere = Radius of the cylinder = 1.4 cm

Height of the cylinder + 2 × Radius of the hemisphere = 5 cm

Height of the cylinder + Diameter of the hemisphere = 5 cm

Thus, height of the cylinder = 5 – diameter of the hemisphere

Height of the cylinder = 5 – 2.8

Height of the cylinder (h) = 2.2 cm

Now, we will calculate the volume of the hemisphere by using the formula (2/3) πr^{3}

The volume of hemisphere = (2/3) × (22/7) × (1.4)^{3}

= 5.75 cm^{3}

Since there are two hemispheres present in one Gulab jamun,

The volume of two hemispheres = 2 × 5.75 cm^{3}

= 11.5 cm^{3}

Now, we will calculate the Volume of the Cylinder by using the formula πr^{2}h

Volume of cylinder = (22/7) × (1.4)^{2} × 2.2

= 13.552 cm^{3}

Let's calculate the volume of the gulab jamun by adding the volume of the cylinder and the volume of the two hemispheres.

The volume of gulab jamun = Volume of the cylinder + Volume of two hemispheres

Volume of gulab jamun = 13.552 cm^{3} + 11.5 cm^{3}

= 25.052 cm^{3}

∴ The volume of 45 gulab jamun = 45 × 25.052 cm^{3}

= 1127.34 cm^{3}

In one gulab jamun, the quantity of the sugar syrup = 30% × Volume of gulab jamun

The quantity of sugar syrup in 45 gulab jamuns = 30% × Volume of 45 gulab jamuns

= 0.3 × 1127.34 cm^{3}

= 338.202 cm^{3}

The quantity of sugar syrup in 45 gulab jamuns = 338.202 cm^{3}