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Published on: 17/06/2021
QB365 provides detailed and simple solution for every book back questions in class 7 Maths subject.It will helps to get more idea about question pattern in every book back questions with solution.
Download Tamil Nadu 7th Standard Maths question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Maths Test1.
A sum of Rs. 46,000 was lent out at simple interest and at the end of 1 year and 9 months, the total amount was Rs. 52,440. Find the rate of interest per year.
2.
In what time will Rs. 5,600 amount to Rs. 6,720 at 6% per annum?
3.
Find the simple interest on Rs. 25,000 at 8% per annum for 3 years?
4.
Malar bought 1.75 m of fabric from a roll of 25 m. Express the fabric bought in terms of percentage?
5.
Convert the given decimals to percentage
0.3
1.
A = P + I
I = A – P
= 52440 – 46000
= Rs. 6,440
r = ?
1 Year and 9 months = \(1\cfrac { 9 }{ 12 } \)
= \(1\cfrac { 3 }{ 4 } \) = \(\cfrac { 7 }{ 4 } \)
we know that, \(I=\cfrac { Pnr }{ 100 } \)
Therefore, \(6440=\cfrac { 46000\times r\times \frac { 7 }{ 4 } }{ 100 } \)
\(r=\cfrac { 6440\times 4\times 100 }{ 46000\times 7 } \)
= 8%
2.
Principal (P) = Rs. 5,600
Rate (r) = 6% per annum
Amount = Rs. 6,720
Amount = principal + interest
Interest = Amount – Principal
= 6720 − 5600 = 1120
We know that Simple Interest \(\left( I \right) =\cfrac { Pnr }{ 100 } \)
\(1120=\cfrac { 6720\times 6\times n }{ 100 } \)
Therefore, \(n=\cfrac { 1120\times 100 }{ 5600\times 6 } =3\cfrac { 1 }{ 3 } years\)
3.
Here, the Principal (P) = Rs. 25,000
Rate of interest (r) = 8% per annum
Time (n) = 3 years
Simple Interest (I) = \(\cfrac { Pnr }{ 100 } \)
= \(\cfrac { 2500\times 3\times 8 }{ 100 } =6000\)
Hence, Simple Interest (I) is Rs. 6,000.
4.
Total length of the fabric = 25 m
Length of the fabric bought = 1.75 m
Percentage of the fabric bought = \(\cfrac { 1.75 }{ 25 } \times \cfrac { 100 }{ 100 } =\cfrac { 175 }{ 25\times 100 } =\cfrac { 7 }{ 100 } =7\%\)
5.
\(0.3=\cfrac { 3 }{ 10 } \times 100\%=30%\)
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Tamilnadu Stateboard 7th Standard Subjects
Tamilnadu Stateboard Standards
