Fortune Telling Collection - Free divination - The Russian novelist Chekhov wrote such a mathematical problem of buying cloth in a novel. Please use arithmetic and equation to solve it.
The Russian novelist Chekhov wrote such a mathematical problem of buying cloth in a novel. Please use arithmetic and equation to solve it.
Solution: Suppose blue cloth bought X Russian ruler and black cloth bought (138-X) Russian ruler.
3X+5*( 138-X)=540
3X+690-5X =540
﹣2X =540-690
﹣2X =﹣ 150
X =75
Black cloth = 138-75 = 63 (Russian ruler)
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