Q&A - P5 Math
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Essential:
HiMathizzfun, could you help me with this question?
Rosie, sandy and Tabby shared a box of cards. Rosie took 1/5 of th total number of cards and another 12 cards. Sandy took 50% of the remaining cards in the box another 13 cards . Tabby took the last 27 cards in the box. How many cards were there in the box at first?
work backwards..
13+27 = 40 = 50% of remaining cards ,
remaining cards after Rosie took = 2 x 40 = 80
80 + 12 = 4/5 of total number of cards =92
Total number of cards in the box = 5/4 x 92 = 115
cheers. -
Essential:
HiHi, need some help to solve this question.
The ration of Ben's cards to Benny's cards was 3:4 After Ben bought another 9 cards and Benny lost 18 cards , the ration became 3:2. Find the total number of cards Ben and Benny had at first.
At first, Ben : Benny = 3u : 4u
After Ben bought another 9 cards and Benny lost 18,
Ben : Benny = 3u + 9 : 4u - 18 = 3 : 2
Cross multiply-
2(3u+9) = 3(4u-18)
6u + 18 = 12u - 54
6u = 72, 1u = 12
3u = 36, 4u = 48. Ben had 36 cards and Benny had 48 cards at first.
cheers. -
Hi MathIzzfun, thank you so much for your replied.
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Essential:
Hi MathIzzfun, thank you so much for your replied.
u r welcome
cheers. -
MGS SA2 2011
Q26
Jerry had some beads. He can divide them equally into 2, 5 or 7 groups. What was the max. number of beads that he had if he had less than 250 beads?
Q29
The figure below has a perimeter of 36cm. It is made up of 9 identical triangles. What is the increase in the perimeter of the figure when a row of triangles is added to the base?
Regret that I do not know how to incorporate the figure here.
My solution: 36/9= 4cm
Increase triangles = 9 - 4base, 2 sides
Hence 6x4=24cm
However answer is only 12cm?
Pls help! -
Superbugs:
HiMGS SA2 2011
Q26
Jerry had some beads. He can divide them equally into 2, 5 or 7 groups. What was the max. number of beads that he had if he had less than 250 beads?
For Q26, find the common multiple of 2, 5 and 7 closest to 250, the answer is 210.
A common method used in primary maths is “Systematic Listing”
A faster way to find the lowest multiple of 70 and multiply by 3.
Best wishes -
Superbugs:
HiMGS SA2 2011
Q26
Jerry had some beads. He can divide them equally into 2, 5 or 7 groups. What was the max. number of beads that he had if he had less than 250 beads?
Q29
The figure below has a perimeter of 36cm. It is made up of 9 identical triangles. What is the increase in the perimeter of the figure when a row of triangles is added to the base?
Regret that I do not know how to incorporate the figure here.
My solution: 36/9= 4cm
Increase triangles = 9 - 4base, 2 sides
Hence 6x4=24cm
However answer is only 12cm?
Pls help!
for q29.. if the figure is as shown, then the increase in perimeter is in red.![](\"http://i53.tinypic.com/why5nm.jpg\")
http://i53.tinypic.com/why5nm.jpg\">
cheers. -
To MazzIzzzFun,
The figure is right! Tks so
Much for your explanation! -
Aitong SA2 P2 Q9
ABCD us a rectangle. It is divided into 4 unequal triangles P, Q, R and S which meet at a point as shown (sorry I am unable to draw the figure here). Find the area of triangle S.
Assume Meet point is H, Some other information:
Triangle ABH - 24cm
Triangle ADH - 51cm2
Triangle CHD - 45cm2
Both ABH and CHD shares the same base (breadth of rectangle)
Kindly assist. Tks -
Aitong P2 Q17
The ratio of Steven’s cards to Benny’s cards was 3:4. After Steven bought another 9 cards and Benny lost 18 cards, the ratio became 3:2. Find the total number of cards Steven and Benny had at first?
Pls help. Tks
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