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A school wants to buy some new desks and chairs?

A school wants to buy some new desks and chairs. If it buys 40 desks and 100 chairs, the total cost is 1100 ; if it buy 50 desks and 80 chairs, the total cost is 1150. What is the price of a desk and chair?

En resumen

40d + 100c = 110050d + 80 c = 1150 - 1. 25 * (50d + 80c) = 1150 * - 1. 25 - 62. 5d - 100c = - 1437. 5 40d + 100c = 1100 - 62. 5d - 100c = - 1437. 5 - 22. 5d = - 337. 5d = - 337. 5 / - 22.

Mejor respuesta

Aargenis7460
2

40d + 100c = 110050d + 80 c = 1150 - 1.

25 * (50d + 80c) = 1150 * - 1.

25 - 62.

5d - 100c = - 1437.

5 40d + 100c = 1100 - 62.

5d - 100c = - 1437.

5 - 22.

5d = - 337.

5d = - 337.

5 / - 22.

5d = 15

50d + 80c = 1150(50 * 15) + 80c = 1150750 + 80c = 115080c = 1150 - 75080c = 400c = 400 / 80c = 5

Answer : The priceis : Chair : 5Desk : 15.