Q&A - P5 Math

[YumYum]

Hi, I need help with the following Qn:


Irene had a total of 1688 red, blue and green balloons for sale. The ratio of the number of red balloons to the number of blue balloons was 2:3.

After Irene sold 3/4 of the blue balloons, 1/2 of the green balloons and none of the red balloons, she had 922 balloons left.

How many blue balloons did Irene have at first?

thanks!

[YumYum]

Need help with one more Qn:


In Jars A and B, there are only blue and red marbles.
In Jar A, 65% of the 700 marbles are blue marbles.
In Jar B, 25% of the 480 marbles are red marbles.
After some of the marbles in both jars were transferred, 20% of the marbles in Jar A and 40% of the marbles in Jar B were red.
How many marbles were there in Jar B after the change?

thanks

[Essential]

Hi my DS need help for Chij paper q15, there were 350 children enrolled in the Eliot Drama Academy in 2009 . 2/7 of the children were girls . Additional children joined the drama academy in 2010. For every 2 girls who joined the drama academy , 1 boy joined the drama academy. If there were equal number of boys and girls in 2010 , how many joined the academy in that year?

[MathIzzzFun]

YumYum:

Hi, I need help with the following Qn:


Irene had a total of 1688 red, blue and green balloons for sale. The ratio of the number of red balloons to the number of blue balloons was 2:3.

After Irene sold 3/4 of the blue balloons, 1/2 of the green balloons and none of the red balloons, she had 922 balloons left.

How many blue balloons did Irene have at first?

thanks!

Hi

Initially, Red : Blue = 2 : 3 = 8u : 12u
Sold = 9u (3/4 blue) + 1/2 Green = 1688 - 922 = 766
Left = 3u (1/4 blue) + 8u (Red) + 1/2 Green = 922

Left - Sold --> 2u = 922 - 766, 1u = 78

Blue Balloons, initially = 12u = 12 x 78 = 936

cheers.

[MathIzzzFun]

YumYum:

Need help with one more Qn:


In Jars A and B, there are only blue and red marbles.
In Jar A, 65% of the 700 marbles are blue marbles.
In Jar B, 25% of the 480 marbles are red marbles.
After some of the marbles in both jars were transferred, 20% of the marbles in Jar A and 40% of the marbles in Jar B were red.
How many marbles were there in Jar B after the change?

thanks

Hi

Initially,
Blue marbles in A = 65% x 700 = 455
Red marbles in A = 700 - 455 = 245

Blue marbles in B = 75% x 480 = 360
Red marbles in B = 480 - 360 = 120

Total Red marbles = 245 + 120 = 365
Total Blue marbles = 455 + 360 = 815
Total marbles = 1180

After transfer:
A = # # # # #
B = @ @ @ @ @

# + @ = 1180 / 5 = 236

# + @ @ = 365
So,
@ = 365 - 236 = 129
# = 236 - 129 = 107

Jar B, after transfer = 5 x @ = 645

cheers.

[MathIzzzFun]

Essential:

Hi my DS need help for Chij paper q15, there were 350 children enrolled in the Eliot Drama Academy in 2009 . 2/7 of the children were girls . Additional children joined the drama academy in 2010. For every 2 girls who joined the drama academy , 1 boy joined the drama academy. If there were equal number of boys and girls in 2010 , how many joined the academy in that year?

Hi

In 2009,
Girls = 2/7 x350 = 100
Boys = 350 - 100 = 250

In 2010, Girls joined = 2u, Boys joined = 1u
Total girls = 2u + 100
Total boys = 1u + 250
So, 2u + 100 = 1u + 250
1u = 150

Number joined in 2010 = 3u = 3 x 150 = 450

cheers.

[Winx5015]

Hi MathIzzzFun,


Thanks for helping. Regarding the question on bags and belts, will check with the teacher. Once I get the answer, will let you know.

Enjoy your weekends

[Essential]

Thank u Mathizzzfun. Thank u so much for your help

[Essential]

Thank u Mathizzzfun. Thank u so much for your help, sorry the question is how many boys joined in 2010?

[MathIzzzFun]

Essential:

Thank u Mathizzzfun. Thank u so much for your help, sorry the question is how many boys joined in 2010?

Hi

it is in the workings.. In 2010, girls joined = 2u, boys joined = 1u
1u = 150 ie 150 boys joined in 2010.


cheers.