SG chevron_right Primary 3 chevron_right Number and Algebra

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SG chevron_right Primary 6 chevron_right Number and Algebra

SG chevron_right Primary 4 chevron_right Number and Algebra

I had spent like 45 minutes working through the various possibilities but still can't figure the answer out. So here is me waving my white flag. Maths expert pls help. My brain is exhausted from the 'strenuous' exercises I had just subjected it through. Thank you all in advance.

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Thank you Ms Yueh Mei for adding me to the group.

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Thank you for approved me and Hui Wen's thank again.