Answer :

2.5 oz of the given food contains 237.5 calories.

To solve the given problem, first we need to know the unitary method of solving the problem involving ratio and proportion.

Unitary method is the method of solving the problems in which we find the value of one unit first and then multiply it to find the required value. It is used to find the value of a unit, when the value of another unit is given.

So, to solve the given problem, we need to first find the value of 1 oz.

Let x be the number of calories in 1 oz of the given food.

Then we can say that,2 oz of the food has = 2x calories. (According to given data, 2 oz is 190 calories)

To find the calories in 2.5 oz of the food, we can use the unitary method;

Number of calories in 1 oz = x

Number of calories in 2 oz = 2x

Number of calories in 2.5 oz = 2.5x calories

We can use the proportionality concept of unitary method;

So, 2 oz of the food has = 2x calories.

1 oz of the food has = x calories.

Thus, 2 oz of the food has = 2 times the calories in 1 oz of the food.

Hence, the number of calories in 1 oz of the food is 190/2 = 95 calories.

So, Number of calories in 2.5 oz of the food = 2.5 times the calories in 1 oz of the food

= 2.5 × 95 calories

= 237.5 calories.

Therefore, 2.5 oz of the given food contains 237.5 calories.

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Rewritten by : Barada