1)A Mathematics examination consists of section A and section B,The time allowed is 80mins.After completing sectionA,Owen had 45 mins left to do section B.What percentage of time did Owen use to complete section A?
2)Mr Lau's monthly salary is $25000.Each month,he spends $6000 on rent and $5000 on food.What percentage of his monthly salary is left?
3)Mary gets $30 pocket money every day and saves 60% of it.How much can she save in a week?
4)The weight of a pencil is85% that of a pen.If the pen weights 12g,find the total weight of the pencil and the pen.
5)There are 160 people in a swimming pool.20% of the people are male adults,35% are female adults and the remaining are children.How many children are there in the swimming pool?
6)A bag contains yellow balls and blue balls.If 25% of the balls are blue and there are150 yellow balls,find the total number of balls in the bag.
7)In a violin examination,4 candidates got grade A and 18% of the candidates got grade B. If 160 candidates got grade C or below,find the total number of candidates in the examination.
Maths questions!!!!!!!!!!!!!!!
2013-12-28 12:18 am
回答 (1)
2013-12-28 4:46 am
✔ 最佳答案
1.Percentage of time that Owen used to complete section A
= [(80 - 45)/80] x 100%
= 43.75%
2.
Percentage of monthly salary left
= [(25000 - 6000 - 5000)/25000] x 100%
= 56%
3.
Amount that she can save in a week
= $30 x 60% x 7
= $126
4.
Total total weight of the pencil and the pen
= 12 x (1 + 80%) g
= 21.6 g
5.
Number of children
= 160 x (1 - 20% - 35%)
= 160 x 0.45%
= 72
6.
Total number if balls
= 150 ÷ (1 - 25%)
= 150 ÷ 75%
= 200
7.
Total number of candidates
= (160 + 4) ÷ (1 - 18%)
= 164 ÷ 82%
= 200
參考: fooks
收錄日期: 2021-04-13 19:52:11
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