The price of pork 250g and beef 150g is 1240 yen.
Find the price of pork 100g and beef 100g respectively.
Answer
Pork : 280 yen, Beef : 360 yen
Solution
According to pork250g + beef150g = 1240 yen, pork500g + beef 300g = 2480 yen.
As pork 150g + beef 300g = 1500g, pork350g = 2480 - 1500 = 980 yen.
Thus pork 100g = 980 / 350 × 100 = 280 yen.
Beef 300g = 2480 - 280 × 5 = 1080.
Therefore beef 100g = 1080 / 3 = 360g.
