Andrei weighs 32 kg, which is 4/7 of the weight of his older sister and 2/5 of the weight of his father. the mother’s weight is 7/8 of the father’s weight. can they all, together, go into an elevator that can hold 300 kg if they also have to take their 17 kg dog?

Yes.

Step-by-step explanation:

Andrei weighs 32 kg.  This is 4/7 of his sister's weight; this means his sister weighs

7/4(32) = 56 kg.

32 kg is 2/5 of his father's weight; this means his father weighs

5/2(32) = 80 kg.

His mother weighs 7/8 of his father's weight; this means his mother weighs

7/8(80) = 70 kg.

Together they weigh

32+56+80+70 = 238.

With his dog, they weigh

238+17 = 255 kg.

This means they can all go into the elevator.

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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