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\ 06-Jan-2025 Bharat Arora Proof-7 Reader’s Sign _______________________ Date __________

10. A man buys postage stamps of denominations 50 paise and 100 paise for `20. He buys 30 stamps in
all. Find the number of 50 paise stamps bought by him.
11. The sum of two numbers is 2490. If 6.5% of one number is equal to 8.5% of the other, find the
numbers.

C F − 32
12. We use = to convert temperatures between degrees Celsius and Fahrenheit. On a winter
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day, the temperature in Siachin was –26°C. Convert this to degrees Fahrenheit (°F).

13. During summer holidays, Sunaina visited Rishikesh for
sightseeing. While exploring, she noticed that a
motorboat traveling downstream along a river, covering Case study
the distance between two coastal towns in five hours.
On its return trip, going upstream, the boat took six
hours to cover the same distance. The speed of the
stream is 2 km per hour.
Based on the above information answer the following questions:

( a) Find the speed of the boat in still water.
( b) Find the speed of the boat in upstream.
( c) Find the time take by the boat if it goes 96 km in downstream.

maths fun

Solve the crossword puzzle with the help of the clues given.
Across
2. A linear equation in one variable has 8. 1. 7.
only ............... solution.
4. A mathematical sentence that contains
an equal sign is known as ............... . 5.
5. A letter used to represent a number is
called ............... .
8. First step to simplify the equation
5(x + 3) = 2(x + 9) is to remove the
............... from both sides. 6.

Down 2.

1. The shifting of a number from one
side of an equation to other is called
............... . 3.
3. Linear equation in one variable has 4.
only one variable with ............... 1.
6. The ............... of the variable, which
satisfies the equation is called solution
of the equation.
7. A linear equation in one variable
cannot have more than one ............... .

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