呢題數點做?"

B.20

let the number be x

2x +1 =41
2x=40
x=20

2x+1=41
2x+1-1=41-1
2x=40
2x/2=40/2
x=20



B.

let the number be x,
2x+1=41
2x=40
x=20
so, the answer is B

ADD 1 to the double of a number and the result is 41.find the number.
D.40

2007-08-06 17:15:44 補充：
我講錯係: 條問題係話把1個數字乘2再加1答案係41 那果個數字係咩？即係x*2 1=41 x=(41-1)/2 x=20

中文: 把1個數字乘2再加1 答案係41 那個數字是..

B.20

B.20...................

ADD 1 to the double of a number and the result is 41.find the number.
係A.11

2*?+1 = 41
2*? = 41-1
2*? = 40
? = 40/2
?= 20

Answer is B