Please help me to answer it..
1)A is 20% more than B,what percentage of A is B?
2)2/3of a number is greater than 20% of 60 by 7.Find the number.
3)If number A increase by 25%,it is equal to number B.Find the percentage of the original value of A to B.
~~~maths...
2007-01-20 5:45 pm
回答 (2)
2007-01-20 6:18 pm
1) let B =x, than A =1.2x
the percentage of A is B =x/ 1.2x * 100% = 0.833 *100% = 83.3% (3sig. fig)
2) let the number be x
2/3x +7 = 60 * (1.2)
x=0.3
3)let A be x, then B is 1.25x
the percentage of A to B = (1.25x-x)/ 1.25x *100% =1 / 1.25 *100% =80%
the percentage of A is B =x/ 1.2x * 100% = 0.833 *100% = 83.3% (3sig. fig)
2) let the number be x
2/3x +7 = 60 * (1.2)
x=0.3
3)let A be x, then B is 1.25x
the percentage of A to B = (1.25x-x)/ 1.25x *100% =1 / 1.25 *100% =80%
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