A man wants to cut three lengths from a single piece of board of length 91 cm. The second length is to be 3 cm longer than the shortest and the third length is to be twice as long as the shortest. What are the possible lengths of the shortest board if the third piece is to be at least 5 cm longer than the second? [Hint: If x is the length of the shortest board, then x, (x + 3) and 2x are the lengths of the second and third piece, respectively. Thus, x = (x + 3) + 2x ≤ 91 and 2x ≥ (x + 3) + 5].

Asked by Last Modified  

Follow 1
Answer

Please enter your answer

Let the length of the shortest piece be x cm. Then, length of the second piece and the third piece are (x + 3) cm and 2x cm respectively. Since the three lengths are to be cut from a single piece of board of length 91 cm, x cm + (x + 3) cm + 2x cm ≤ 91 cm ⇒ 4x + 3 ≤ 91 ⇒ 4x ≤ 91 ­–...
read more
Let the length of the shortest piece bexcm. Then, length of the second piece and the third piece are (x+ 3) cm and 2xcm respectively. Since the three lengths are to be cut from a single piece of board of length 91 cm, xcm + (x+ 3) cm + 2xcm≤91 cm ⇒4x+ 3≤91 ⇒4x≤91 ­– 3 ⇒4x≤88 Also,the third piece is at least 5 cm longer than the second piece. ∴2x≥(x+ 3) + 5 ⇒2x≥x+ 8 ⇒x≥8 … (2) From (1) and (2), we obtain 8≤x≤22 Thus, the possible length of the shortest board is greater than or equal to 8 cm but less than or equal to 22 cm. read less
Comments

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Recommended Articles

Quality education does not only help children to get a successful career and life, but it also hugely contributes to society. The formal education of every child starts from school. Although there are numerous schools, parents find it challenging to choose the right one that would fit their child. It is difficult for them...

Read full article >

While schools provide formal education to the children, the home is where they start learning about things informally. Parents think that schools will take the initiative to educate their children. Well, this is partially true, as parents also play an essential role in bringing up their child. For the development of particular...

Read full article >

Appearing for exams could be stressful for students. Even though they might have prepared well, they could suffer from anxiety, tension etc. These are not good for their health and mind. However, following a few exam preparation tips can save them from all these and help them to score good marks. Let’s find out all...

Read full article >

With the mushrooming of international and private schools, it may seem that the education system of India is healthy. In reality, only 29% of children are sent to the private schools, while the remaining head for government or state funded education. So, to check the reality of Indian education system it is better to look...

Read full article >

Looking for Class 11 Tuition ?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you