搜狗做题网小升初英语奥数Two numbers are in the ratio 2 :3.When 4 is added to
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小升初英语奥数
Two numbers are in the ratio 2 :3.When 4 is added to each number the ratio changes to 5 :7.The sum of the two original numbers is____.
40,16和24 能告诉我为什么这么做?
还有这题：Saul plays a video game in which he scores 4 for a hit and lost 6 for a miss.After 20 rounds his score is 30.The number of times he has missed is____.
Two numbers are in the ratio 2 :3.When 4 is added to each number the ratio changes to 5 :7.The sum of the two original numbers is____.
40,16和24 能告诉我为什么这么做?
还有这题：Saul plays a video game in which he scores 4 for a hit and lost 6 for a miss.After 20 rounds his score is 30.The number of times he has missed is____.
两个数的比例是2：3,每个数加4,比例变成5：7,两个数的和是多少?40
设一个是2x,另一个是3x,（2x+4）：（3x+4）=5：7,x=8,所以两个数和是2x+3x=5x=5*8=40.
Saul玩一个游戏,赢一局得4分,输一局失6分,20局后,他分数是30,问,他输了几局?
设输了x局,赢了20-x局,（20-x）*4-6x=30,x=5,所以输了5局
设一个是2x,另一个是3x,（2x+4）：（3x+4）=5：7,x=8,所以两个数和是2x+3x=5x=5*8=40.
Saul玩一个游戏,赢一局得4分,输一局失6分,20局后,他分数是30,问,他输了几局?
设输了x局,赢了20-x局,（20-x）*4-6x=30,x=5,所以输了5局
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