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**Hint:**In question it is given that radius of tank is 1.5 m and length is 7 m and capacity here is volume of tank . so, using the formula of volume of cylinder we can easily find the capacity of the tank as it is mentioned in the question that the tank is cylindrical.

**Complete step by step answer:**

Now, it is given that the length of the tank is 7 m and length of tank = height of cylinder.

So, we can say that height of cylindrical tank = 7 m

Now, the radius of the tank is 1.5 m.

So, radius of cylindrical tank = 1.5 m

From figure, OD = Radius of tank = 1.5 m and AB = height of tank = 7 m

Now, we know that Volume of Cylinder $=\pi {{r}^{2}}h$ , where r denotes radius of cylinder and h denotes height of cylinder and value of $\pi =3.14$ or $\pi =\dfrac{22}{7}$ .

So, volume of cylinder ABCDO $=\pi {{r}^{2}}h$……. ( i ), where r = 1.5 m and h = 7 m

So, substituting values of r = 1.5 m and h = 7 m in equation ( i ), we get

Volume of cylinder ABCDO $=\pi {{(1.5)}^{2}}(7){{m}^{3}}$

Putting $\pi =\dfrac{22}{7}$, we get

Volume of cylinder ABCDO \[=\dfrac{22}{7}\cdot {{(1.5)}^{2}}\cdot (7){{m}^{3}}\]

On solving, we get

Volume of cylinder ABCDO \[=22\cdot {{(1.5)}^{2}}{{m}^{3}}\]

On simplifying, we get

\[\text{=22 }\!\!\times\!\!\text{ 2}\text{.25}{{\text{m}}^{\text{3}}}\]

\[\text{=49}\text{.5}{{\text{m}}^{\text{3}}}\]

Now, answer is asked in litres, so we will convert metric cube into litres

Now, we know that $\text{1}{{\text{m}}^{\text{3}}}\text{=1000 litres}$

So, $\text{49}\text{.5}\times \text{1}{{\text{m}}^{\text{3}}}\text{=49}\text{.5}\times \text{1000 litres}$

On simplifying, we get

$\text{=49500 litres}$

**Hence, milk tank capacity is 49500 litres.**

**Note:**For, solving volume related problems one must know the formulas of volumes of various shapes such as cube, cuboid, sphere, frustum, cylinder etc. now, while substituting the value of $\pi $ , choose that value which will make your calculation simpler. Calculation error must be avoided and always mention the S.I unit.

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