Question

the average cost of 3 erasers was Rs.3.45. the average cost of the first 2 erasers was Rs.3.15. find the cost of the third eraser. ​

Answer 1

the cost of the third eraser is rupees 4.05

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Answer 2

Cost of third eraser is Rs. 4.05.

Step-by-step explanation:

Since we have given that

Average cost of 3 erasers = Rs. 3.45

So, Cost of 3 erasers would be

$3.45\times 3\\\\=Rs.\ 10.35$

Average cost of first 2 erasers = Rs. 3.15

So, Cost of first 2 erasers would be

$3.15\times 2\\\\=Rs.\ 6.3$

So, the cost of third eraser is

$10.35-6.3=Rs.\ 4.05$

Hence, Cost of third eraser is Rs. 4.05.

# learn more:

The average cost of 3 erasers was Rs.3.45. the average cost of the first 2 erasers was Rs.3.15. find the cost of the third eraser. ​

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