Question

ages will be 30 years. Wat die uit
10. The number of boys and girls in a class are in the ratio 7:5. The number of boy
more than the number of girls. What is the total class strength?
11. Baichung's father is 26 years younger than Baichung's grandfather and 29 yea
of all the three is 135 years. What is the age of each one of them ​

Answer 1

Answer:

10. 48

11 .Baichung = 17, father age = 46 & grandfather age = 72

Step-by-step explanation:

10. Steps :

Let the no. of girls be 5x

No. of boys=7x

According to the question

5x+8=7x

7x-5x=8

2x=8

x=8/2

x=4

No. of girls=5*4=20

no. of boys=7*4 or 5*4+8=28

Hence the total strength of the class is 20+28=48

11. Steps:

let the baichungs father age be x

therefore baichungs grandfather age be x+26

therefore baichungs age is x-29

baichungs age+baichungs grandfather age + baichungs father age is equal to sum of there ages

x+x+26+x-29 -135

3x+26-29 - 135

3x+(-3)-135

3x - 135+3

3x - 138

X is equal to 138 divided by 3

x is equal to 46

hence father age is 46 years (x)

hence grandfather age is 72years(x+26)

hence baichungs age is 17 years(x-29)

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