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P5 Mathematics

Question post on Sun, 14/07/2019 12:04pm

P5 (Problem-solving Beyond Classroom)

1.2, Q5)

Sarah and Elena went shopping together with a total of $654. Elena spent 3 times as much as Sarah. They saved the rest of their money. Sarah spent $128 less than what she had saved. In the end, Sarah saved twice as much money as Elena.

A) How much money did Sarah spend

B) How much money did Elena have at first

Answer

bbcxd · Answer 1 · Post on Sun, 14/07/2019 4:36pm

bbcxd Post on Sun, 14/07/2019 4:36pm

bbcxd · Answer 2 · Post on Sun, 14/07/2019 4:36pm

bbcxd

Post on Sun, 14/07/2019 4:36pm

mummyp2 · Answer 3 · Post on Sun, 14/07/2019 9:26pm

Thank you!

Couldn’t ‘see’ it cos we lumped the spent and saved blocks together. Thank you again!

bbcxd · Answer 4 · Post on Mon, 15/07/2019 11:04am

bbcxd Post on Mon, 15/07/2019 11:04am

You are welcome😊

alfretztay · Answer 5 · Post on Mon, 22/07/2019 10:11am

(a)
Elena spent : 3u
Sarah spent : 1u
Elena saved : 1p
Sarah saved : 2p

4u + 3p ——-> 654
2p ——-> 1u + 128
1u ——-> 2p – 128
4 x (2p – 128) + 3p = 8p – 512 + 3p = 11p – 512 ——-> 654
1p ——-> (654 + 512)/11 = 106
1u ——-> 2 x 106 – 128 = 84

(b)
3u + 1p ——-> 3 x 84 + 106 = 358

Ans : (a) $84; (b) $358.