Percentage Problem Sums

Ashleeann hannah SG

A minute ago,40% of the 480 children in a school hall were girls. Some more children entered the hall and the number of boys increased by 50%. Now 80% of the children in the hall are girls. How many girls had just entered the school hall?

Ashleeann hannah SG

Entrance tickets to the Jurong Bird Park are $4 each for a child. Each ticket for an adult costs 25% more. Yesterday,60% of the tickets sold were for children. The total sale of the tickets amounted to $5940. What was the total value of tickets sold for adults?

Ashleeann hannah SG

The ratio of the number of plants in plantation A to that in plantation B was 12:5. Last week, a fire destroyed 80% of the plants in plantation A. What percentage of the plants in plantation B must be transplanted to plantation A so that there will be an equal number of plants in the two plantations?

dkcx SG

40% X 480 = 192 girls = 288 boys

50% increase = 432 boys (20%)

No. of girls (80%) = 432 X 4 = 1728

No. of girls entered = 1728 - 192 = 1536

dkcx SG

Adult ticket = 25% more than child ticket

40% adult ticket price = 40 X 125% = 50% children ticket price

Total sales = 5940 = 50 + 60 = 110%

Adult tickets = 50% = $2700

dkcx SG

80% of 12 = 9.6

Plants left = 2.4

Ratio = 2.4:5

To balence out means need 3.7

This means 1.3 of B must go to A.

% of plants to transfer is 1.3/5 X 100% = 26%

nganmatthias SG

1 Child Ticket: $4

1 Adult Ticket: $5

40% Adult Tickets, 60% Children Tickets

For every 4 adults, there are 6 children.

Price of 4 Adult Tickets + 6 Children Tickets = $20+$24

= $44 (1 group)

Number of groups: $5940÷$44=135

1 group has 4 adults.

135 groups have 540 adults.

540 adult tickets cost $2700.

baiyun SG

Hope this helps.I assume that this is a P5/6 question and calculator is allowed to be used.