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primary 5 | Maths
| Rate & Ratio
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P5 fractions - ..) pls help
Date Posted: 3 years ago
Views: 582
In canteen: Boys & Girls
B + G = 331
Returned: Boys & Girls
B + G = 91
Leftover in Canteen: Boys & Girls
331-91 = 240
Hence,
4/5 B + 2/3 G = 240
G = 331-B
4/5B + 2/3 (331-B) = 240
4/5B + 2*331/3 - 2/3B = 240
2B/15 = 240 - 662/3
2B/15 = 58/3
B = 58*15/6 = 145
initially 145 boys were in the canteen.
B=145
G = 331-145 = 186
4/5*145 + 2/3*186 = 116 + 124 = 240
B + G = 331
Returned: Boys & Girls
B + G = 91
Leftover in Canteen: Boys & Girls
331-91 = 240
Hence,
4/5 B + 2/3 G = 240
G = 331-B
4/5B + 2/3 (331-B) = 240
4/5B + 2*331/3 - 2/3B = 240
2B/15 = 240 - 662/3
2B/15 = 58/3
B = 58*15/6 = 145
initially 145 boys were in the canteen.
B=145
G = 331-145 = 186
4/5*145 + 2/3*186 = 116 + 124 = 240
Thanks .Is there any easier method ? As this method might not suit primary school kids . They have not learnt simultaneous equations
Thanks
Thanks
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