Question

Cost of $5$ kg tomatoes in Rs. $80$
What will be the cost of $8$ kg of tomatoes?

Answer 1

Hint: Here by using the cross-multiplication we will directly find the cost of the required kg of the tomatoes. To get the required resultant answer first remove common multiples from the numerator and the denominator and then multiply the remaining terms in the numerator.

Complete step-by-step answer:
Given that:
Cost of $5$ kg tomatoes $ = $Rs. $80$
Cost of $8$ kg tomatoes $ = ?$
Here the value of one side of the equation is multiplied with the value of the second equation on the opposite side.
$ = \dfrac{{80 \times 8}}{5}$
Find the factors of the term on the numerator of the above expression –
$ = \dfrac{{16 \times 5 \times 8}}{5}$
Common factors from the numerator and the denominator cancel each other.
$ = 16 \times 8$
Simplify the above expression finding the product of the terms –
$ = 128$ Rs.
Hence, the cost of eight kg tomatoes will be Rs. $128$
So, the correct answer is “Rs. $128$”.

Note: Here we can solve the given example by another method such as, first to find the cost of one kg tomatoes by using the method of division and then by using the method of multiplication to get the cost of eight kg. tomatoes. Be good in multiplication and division and remember the multiples at least till the number twenty.