Advertisements
Advertisements
Question
Look at this riddle?
If she answers the riddle correctly how ever will she pay for the pencils?
Solution
Let, the cost of one pencil be ₹ x.
Now, the cost of such 7 pencils will be ₹ 7x and of 5 pencils will be ₹ 5x.
It is given that cost of 7 pencils is ₹ 6 more than the cost of 5 pencils. Therefore, we get the ' following equation
7x – 5x = 6
⇒ 2x = 6
⇒ `(2x)/2 = 6/2` .....[Dividing both sides by 2]
⇒ x = 3
Since, the cost of one pencil is ₹ 3.
So, the cost of 10 pencils = 3 × 10 = ₹ 30
Thus, she has to pay ₹ 30 for 10 pencils.
APPEARS IN
RELATED QUESTIONS
Set up equation and solve them to find the unknown number in the following case:
Ibenhal thinks of a number. If she adds 19 to it and divides the sum by 5, she will get 8.
In an isosceles triangle, the base angles are equal. The vertex angle is 40°. What are the base angles of the triangle? (Remember, the sum of three angles of a triangle is 180°).
In a bag there are 5 and 2 rupee coins. If they are equal in number and their worth is ₹ 70, then
The equation formed is ______.
A number divided by 2 and then increased by 5 is 9.
Subramaniam and Naidu donate some money in a Relief Fund. The amount paid by Naidu is ₹ 125 more than that of Subramaniam. If the total money paid by them is ₹ 975, find the amount of money donated by Subramaniam.
9 added to twice a number gives 13. Find the number.
My younger sister's age today is 3 times, what it will be 3 years from now minus 3 times what her age was 3 years ago. Find her present age.
If 45 is added to half a number, the result is triple the number. Find the number.
The sum of two consecutive multiples of 2 is 18. Find the numbers.
Follow the directions and correct the given incorrect equation, written in Roman numerals:
Remove two of these matchsticks to make a valid equation:
