A shopkeeper sells 2 kg sugar and 3 kg rice for ₹130, and 3 kg sugar and 2 kg rice for ₹120. The price of 1 kg rice is: A. ₹30 B. ₹20 C. ₹25 D. ₹35 Answer: A) ₹30 Explanation: Let sugar=x, rice=y. 2x+3y=130, 3x+2y=120. Δ=4−9=−5. Δ_y = 2·120−3·130 = 240−390 = −150. y = −150/−5=30.

imo class 12 determinants

A shopkeeper sells 2 kg sugar and 3 kg rice for ₹130, and 3 kg sugar and 2 kg rice for ₹120. The price of 1 kg rice is:

VAVidaara Admin Asked 6d ago 0 views 0 answers

A shopkeeper sells 2 kg sugar and 3 kg rice for ₹130, and 3 kg sugar and 2 kg rice for ₹120. The price of 1 kg rice is:

Answer: A) ₹30

Explanation: Let sugar=x, rice=y. 2x+3y=130, 3x+2y=120. Δ=4−9=−5. Δ_y = 2·120−3·130 = 240−390 = −150. y = −150/−5=30.

No comments yet — start the discussion.