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Question
primary 5 | Maths
| Whole Numbers
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I need help with this question. I have bee struggling on this for an hour. And my teacher says I need to do Assumption method.
total: 32
3-leg: 1u
4-leg: 32 - 1u
legs
total: 117
3-leg: 1ux3 = 3u
4-leg: (32 - 1u) x 4 = 128 - 4u
3u + 128 - 4u = 117
1u = 11
3-leg = 11
4-leg = 21
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Assumption method
assume all stools are 4-leg
legs
total: 4 x 32 = 128
but total = 117
diff. = 128 - 117 = 11
hence,
3-leg = 11
&
4-leg = 32 - 11 = 21
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See 1 Answer
Divide that by 1 (difference in 4-legs and 3-legs) and that's the number of 4-legged stools. Then find the number of 3-legged stools.