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Solving an Equation

b Set up equa...

Question

Question 1(b)
Set up equations and solve them to find the unknown numbers in the following cases:
One - fifth of a number minus 4 gives 3.

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Solution

Let the number be y.
According to the question, $\frac{y}{5} - 4 = 3$
$\Rightarrow \frac{y}{5} = 3 + 4 \Rightarrow \frac{y}{5} = 7 \Rightarrow y = 7 \times 5 \Rightarrow y = 35$

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Similar questions

Q. Question 1(a)
Set up equations and solve them to find the unknown numbers in the following cases:
Add 4 to eight times a number; you get 60.

Q. Set up equations and solve them to find the unknown numbers in the following cases :
(a) Add 4 to eight times a number ; you get 60 .
(b) One - fifth of a number minus 4 gives 3 .
(c) If I take three -fourths of a number and add 3 to it . I get 21 .
(d) When I substracted 11 from twice a number , the result was 15 .
(e) Munna substracts thrice the number of notebooks he has from 50 , he finds the result to be 8 .
(f) Ibenhal thinks of a number . If she adds 19 to it and divides the sum by 5 , she will get 8 .

Q. Question 1(g)
Set up equations and solve them to find the unknown numbers in the following cases:
Think of a number. If he takes away 7 from

\frac{5}{2}

of the number, the result is

\frac{11}{2}

Set up the equation and solve it to find the unknown number in the following case:
Ibenhal thinks of a number. If she adds $19$ to it divides the sum by $5$ , she will get $8$ .

Q. Question 1(c)
Set up equations and solve them to find the unknown numbers in the following cases:
If I take three-fourth of a number and add 3 to it, I get 21.

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Solving an Equation

Standard VII Mathematics

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