Answer:
a) The total weight of fruits is
kilograms, b) The weight of the fruits left is
kilograms.
Step-by-step explanation:
a) The total weight of fruits (
) is calculated by the following formula:

Where:
- Total weight of apples, measured in kilograms.
- Total weight of mangoes, measured in kilograms.
- Total weight of oranges, measured in kilograms.
If
,
and
, then:




The total weight of fruits is
kilograms.
b) The weight eaten by her family is determined by the following expression:

Where:
- Eaten weight of apples, measured in kilograms.
- Eaten weight of mangoes, measured in kilograms.
- Eaten weight of oranges, measured in kilograms.
Given that
,
and
, the weight eaten by her family is:




The weight of the fruits left is found by subtraction:





The weight of the fruits left is
kilograms.