Q&A - PSLE Math
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![](\"http://i53.tinypic.com/2h6abzc.jpg\")
http://i53.tinypic.com/2h6abzc.jpg\"> Hi Can someone advise what is the sum of angles a, b, and c shown in the picture? Thanks in advance.
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jesschan:
Hi
are there any information missing ?
cheers. -
jesschan:
You didn't specify if there are any straight lines in the figure. Assuming that the 2 lines passing angle C are straight lines, then the answer should be 2c.
The 2 unknown angles are (180 -c) x 2 = 360 - 2c
Sum of a,b,c = 360 - (360-2c) = 2c. -
Hi lizawa,
All the lines drawn are straight lines, meaning a+b = c since they are vertically opp angles. But other than that, no info was given. Answer is 300 degrees. -
Hi… Can someone pls help with this question - thanks!
Linda mixed 3 l of blue paint with 7 l of white paint. She then poured out 4 l of the mixture into a pail and added 6 l of red paint into the pail. Find the ratio of the volume of blue paint to the volume of red paint in the pail. -
thankyou
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four boys, Alex,Ben,carl and dan shared the cost of a present equally. carl had some money but he did not have enough to pay for his share.Alex paid more to makeup the difference for carl. the amount of money paid by alex is 1/2of the total amount paid by ben, carl and dan. the amount of money paid by ben is 1/3 of the amount paid alex,carl,and dan. the amount of money paid by carl is 1/5 of the total amount paid by alex,ben and dan.if carl returned $38 to alex the next day, find the cost of the present.
how to solve this -
In the toy shop, there were 32more dolls than toy cars. When 2/7 of the toy cars were sold, there were 80 toy cars fewer than dolls.
a] How many dolls were in the shop at first?
b] What fraction of dolls must be sold so that there would be the same number of dolls as toy cars left now? (Give your answer in its simplest form)
how to solve this sum -
raghupavithra:
the amount of money paid by carl is 1/5 of the total amount paid by alex,ben and danfour boys, Alex,Ben,carl and dan shared the cost of a present equally. carl had some money but he did not have enough to pay for his share.Alex paid more to makeup the difference for carl. the amount of money paid by alex is 1/2of the total amount paid by ben, carl and dan. the amount of money paid by ben is 1/3 of the amount paid alex,carl,and dan. the amount of money paid by carl is 1/5 of the total amount paid by alex,ben and dan.if carl returned $38 to alex the next day, find the cost of the present.
how to solve this
Carl paid []
total amount paid by Alex , Ben and Dan [][][][][]
Carl paid 1/6 of the total cost
Carl should pay 1/4 of the total cost as four boys shared the cost of a present equally
the amount that Alex paid more to makeup the difference for carl = 1/4 - 1/6 = 1/12
1u --> 38
12u --> 38*12 = 456
the cost of the present is $456 (Ans) -
raghupavithra:
a)In the toy shop, there were 32more dolls than toy cars. When 2/7 of the toy cars were sold, there were 80 toy cars fewer than dolls.
a] How many dolls were in the shop at first?
b] What fraction of dolls must be sold so that there would be the same number of dolls as toy cars left now? (Give your answer in its simplest form)
how to solve this sum
D [][][][][][][][32]
C [][][][][][][]
When 2/7 of the toy cars were sold, there were 80 toy cars fewer than dolls.
D [][][][][][][][32]
C [][][][][]
2u + 32 --> 80
2u --> 80 - 32 = 48
1u --> 24
At first , no. of dolls were in the shop = 7u + 32 = 7*24 + 32 = 200 (Ans)
b)
5u --> 5*24 = 120
the fraction of dolls must be sold = (200-120)/200 = 80/200 = 2/5 (Ans)
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