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Six point six.
Class of 2006;
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Saturday, October 10, 2009
we r too stupid for PSLE ya for those who cousins took the PSLE this year, maybe u heard that the maths paper was a killer. even yahoo news posted about it: http://sg.news.yahoo.com/cna/20091010/tap-464-parents-arms-psle-mathematics-pa-231650b.html ya so anyway my dad sent me 2 of the questions n i was like thinking how hard can it get? here r the 2 questions: 1)Sally baked some cookies to sell. ¾ of them were chocolate cookies and the remaning were almond cookies. After she sold 210 chocolate cookies and 5/6 of the almond cookies, she had 1/5 of the cookies left. How many cookies did she sell? 2)Jane bought a packet of sweet and gave half to Sunny. Sunny bought a packet of chocolate and gave half to Jane. Jane ate 12 chocolates, and Sunny ate 48 sweets. The ratio of sweets to chocolates Jane had became 1:7 and the ratio of sweets to chocolates Sunny had became 1:4. How many sweets did Jane buy? thinks its easy???????? i got 448.21(something like that) for first question n cant do 2nd Pee got another number with demicals too n didnt bother with the 2nd my friend got the same for first question n get a negative ans for the 2nd..... my maths teacher total shutdown(she tio stun) lol is it really that diff? i consulted mr boh n he said it was deceptively easy but very tough. u can c can do, cant c gg. so anyone with the proper solutions pls post up ^^ n good luck to whosever cousins/siblings taking this year PSLE(including 3 of my cousins) chicky Woohoo I found solution 1 (I think) (1) : (5/6)(3/4) = 5/8 [Almonds account for this amount of sales] (4/5) is the fraction of total cookie sales, so (4/5) - (5/8 from almond cookies) = 7/40 (7/40) is the amount of chocolate cookies sold, so we convert (4/5) to (32/40) to make it easier for our (7/40). Then we have 7/40 = 210 chocookies, 1/40 = 30chocookies. Finally 30x32 to get the total number of sold cookies, which is 960 (ANSWER). Total amount of cookies in all is 1200 fyi, I worked backwards with this and the numbers tally. But it's harder than our '06 PSLE for sure, do this question without drawing diagrams is the equivalent of stapling your eyelids closed. UPDATE: Found 2nd one
Jane's sweets to chocolate ratio = x:7x Sunny's sweets to chocolate = y:4y Jane ate 12 chocolates gives us the equation (x+12) = y ; or (x= y- 12) - [1] Copy above, Sunny eating 18 sweets results in 4y+18 = 7x - [2] Sub [1] into [2] and we have: 4y+18=7(y-12) Simplify to (4y+18 = 7y - 84) and then (3y = 102) y = 34, and because from the given text and [1] we can see that 2y = Sunny's sweets (sorry I forgot to mention it before) So the answer is just 2(34) which is 68. See Yahoo's article and 68 is also the answer, whoopee. We'd learnt algebra/ratio in P6 but back then you'd need to be on mental steroids to visualise until liddat. Now why the hell am I doing PSLE questions when my exams are less than a week away....
-Jin 3:28 PM |