Freight train

The train carries 525 tons of limestone in 29 wagons. Wagons are 15 tonne and 20 tons. How many is 15 ton and how many is 20 ton wagons?

Correct answer:

x =  11
y =  18

Step-by-step explanation:

15 x + 20 y = 525

15•x + 20•y = 525

x+y = 29
15x+20y = 525

x = 11
y = 18

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