AT:

http://i61.tinypic.com/2jdnslt.jpg\">


Hi All,

Need your help to solve the question above.

Thanks & Regards
AT

Ratio.......Q..........R.....diff
...............3...........5......2

unshaded..Q..........R.....diff
.................7.........15......8

make diff the same
Ratio.......Q..........R.....diff
...............12.........20......8

unshaded..Q..........R.....diff
.................7.........15......8

common shaded part=20-15=5 or 12-7=5
5units------225
1unit-------45
15 units-----45x15=675 (unshaded R)

doraemo:

http://i60.tinypic.com/334lqfo.jpg\"> [IMG]


pls help..

Solution to 2nd Question

Area of 6 quadrants - 2 x Area of unshaded part + Area of unshaded semi circle + Area of unshaded triangle

redruby:

http://i57.tinypic.com/1z1rcw5.jpg\">

Number of girls
Last yr...1u
This yr...1.25u
(boys no change)

Ave amt raised by girls
Last yr..$115
This yr..$115x0.20=$138

Total amount raised by girls
Last yr...$115u
This yr...$138x1.25u=$172.5u

Total amount raised by boys
Last yr....$(78800-115u)
This yr....$(101400-172.5u)
Difference increase=$(101400-172.5u)-$(78800-115u)
............................=$(22600-57.5u)
This amount is 10% or 0.1 increased from last year total amount.
(22600-57.5u)/(78800-115u)=0.1
22600-57.5u=7880-11.5u
46u=14720
1u=320

a) The amount raised by the girls this year=$172.5u
........................................=$172.5x320=$55200

b) The no of girls increased =320x0.25=80

MLAStar:

Please help with this question!


At 0900 Shane and Joey started jogging from the same place but in opposite directions along a straight line. After jogging for two hours, they were 18km apart. If Shane's average jogging speed was 5.2km/h, find the distance travelled by Joey from 0900 to 1100.

(1) 10.4km
(2) 7.6km
(3) 4.5km
(4) 3.8km

..............J...........18km...............S
.............<----------!---------------------->\t
------------------------x------------------------------\t\t
\t\t
After 2h, Shane jogged 5.2x2=10.4km\t\t
Joey jogged 18-10.4=7.6km

DedicatedDad:

DedicatedDad:

pls help.thanks.

http://i62.tinypic.com/kevu9v.jpg\">

I think the square STYZ should be fully shaded.
So cut the two square into 8 small triangles each,
and the rectangle 4 small triangles.
Total triangles =8x2+4=20
Shaded triangles =8+3=11
Fraction of shaded figure=11/20

DedicatedDad:

Pls help with this qn.Thanks

20% of Jack's stamps is equal to 30% of Vindra's stamps. 25% of Jack's stamps is equal to 35% of Vindra's and Kumar's stamps. Given that Jack and Kumar had a total of 242 stamps, how many stamps did Vindra have?

20%=1/5.....30%=3/10.......25%=1/4....35%=7/20

J……….…V…….............…….J……..VK\t\t
1/5..….3/10…...........….1/4……7/20\t\t
3/15....3/10…...........….7/28…7/20\t\t
\t\t
J……..V\t\t
15….10\t\t
.3…...2\t\t
.21….14\t\t
...................}make J's share the same in both sets of ratio
J…………VK\t\t
28…….…20\t\t
.7………..5\t\t
21……..15\t\t
\t\t
J…..V……K\t\t
21…14….1\t\t
\t\t
21u+1u=22u---->242\t\t
1u=242/22=11\t\t
V--->14u=14x11=154

snowball:

Lisa is 1/5 as old as her father now.

In 3 years' time, she will be 1/4 as old as her father. How old is Lisa now ?

TIA

Present age
Lisa.................Father...Diff
...1.....................5.........4

3 years' time
Lisa.................Father...Diff
...1......................4........3

Make Age difference the same

Present age
Lisa.................Father......Diff
.1x3=3..........5x3=15.......4x3=12

3 years' time
Lisa.................Father.......Diff
.1x4=4.............4x4=16.....3x4=12

4u-3u=1u---->3...(or 16u-15u=1u)
Lisa is 3x3=9 years old

KOOLMUM:

Hi


Please help with these questions, thanks.

Car X and Car Y started travelling at 0945 from opposite ends of a straight road. Car X traveled at an average speed of 80 km/h. Car Y traveled 20 km/h faster and took 3/4 hour less than Car X to travel the entire distance. Find the time when both cars met.

Ratio\t\t\t\t\t
Speed of Car X……….Speed of Car Y…Total (p)\t\t\t\t\t
…….80……………………………….100
......4......…………………………..5…….………..9 \t\t\t\t\t
\t\t\t\t\t
Time of Car X……………..Time of Car Y……..Diff (u)\t\t\t\t\t
……….5…………………………………..4…………………1 \t\t\t\t\t
\t\t\t\t\t
Difference in time taken 1u=3/4 hr
\t\t\t\t\t
Time taken by Car X: 5u= 5x3/4=3.75h\t\t\t\t\t
Distance 9p by Car X takes -----> 3.75h\t\t\t\t\t
Distance 4p------->3.75/9p x 4p=1 2/3h=1h 40min\t\t\t\t\t
Meet 1h 40 min later------>1125

KOOLMUM:

Hi


Please help with these questions, thanks.

A pharmacist paid $2363 for some bottles of vitamins and fish oil. He bought 4 times as many bottles of fish oil as vitamins. Each bottle of fish oil cost $19 less than each bottle of vitamins. He spent $901 more on the fish oil than on the vitamins. How much does each bottle of vitamins cost?

MLAStar:

Hi all, I need a quick help with this question. Thanks!

http://i60.tinypic.com/ao5753.jpg\">

2363-901=$1462
1462/2=$731
731+901=$1632
Cost of fish oil=$1632-->4u
Cost of vitamins=$731->1u

1u cost of fish oil=1632/4=$408
1u cost of vitamin=$731

Difference in cost of 1u =731-408=$323
Difference in 1 bottle of fish oil and vitamin=$19

No of bottles for 1u =323/19=17
Cost of 1 bottle of vitamin=$731/17=$43

dnnsy:

Hi Gurus, appreciate your help in the following. Thanks!


Kris baked 68 muffins every day. Five days after Kris started baking, Mandy started baking 90 muffins each day. How many muffins had Kris baked when Mandy had baked 254 more muffins than Kris?

68x5=340
Total difference=340+254=594
Unit difference=90-68=22
No of days Mandy take =594/22=27
No of days Kris take=27+5=32
No of muffins Kris baked=32x68=2176