maths solution 2 and 3 added

[akanksha0812]

Related Issue

• Info about Issue or bug

Fixes: #[640]

Describe the changes you've made

I have added half maths problems soltutions.

Checklist:

• [x] My code follows the style guidelines of this project.
• [x] I have performed a self-review of my own code.
• [x] I have commented my code, particularly in hard-to-understand areas.
• [x] I have made corresponding changes to the documentation.
• [x] My changes generate no new warnings.

Screenshots

Original	Updated
original screenshot	updated screenshot

[github-actions[bot]]

Our team will soon review your PR. Thanks @akanksha0812 :)

[Amit366]

@akanksha0812 add screenshot

[github-actions[bot]]

Thank you @akanksha0812 for taking out your valuable time in order to contribute to our project. Looking forward for more such amazing contributions :).