số bút xanh chiếm số % là
1 / (1+4 ) = 0,2 =20%
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There are a number of balls not more than 80 tablets,in which the number of red balls is 5 times the number of green balls.If you add 3 more green balls then the red ball numberis 4 times higher than green balls.At firt,how many red balls?How many green balls?
có nghĩa là
Có một số quả bóng không quá 80 viên, trong đó số quả bóng màu đỏ là gấp 5 lần số quả bóng màu xanh lá cây. Nếu bạn thêm 3 quả bóng xanh thì quả bóng màu đỏ số 4 lần cao hơn quả bóng xanh. có bao nhiêu quả bóng màu đỏ?
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