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In ∆ABC and ∆ CDA ∠ BAC = ∠ ACD (Alt angles, I || m) AC = AC (common) ∠ BCA = ∠ DAC (Alt angles) So, ∆ABC ≅ ∆ CDA by ASA congruency
A spent 25% of his monthly income on study and 55% of the remaining on rent. If amount spent on rent is Rs. 825, then find the amount spent on study