Question

15. AVERAGES
The average of three numbers is 24 and that of last two is 30. then find the first number
x 20
2) 42
3) 12
4) 18​

Answer 1

Step-by-step explanation:

let numbers be x,y ,z

ACC. to question

(x+y+z)/3=24

x+y+z=72

y+z=72-x ........1

and, (y+z)/2=30

y+z=60 .........2

equating equation 1&2

72-x=60

x= 72-60

x= 12

Hence first number is x i.e. 12

Answer 2

Answer:

12

Step-by-step explanation:

let the 3 numbers be x, y and z

Given,

(x+y+z)/3=24

x+y+z=24*3=72 -------> 1

(y+z)/2=30

y+z=30*2=60 ------- > 2

substitute 2 in 1

x+60=72

x=72-60

x=12

Hope it helps

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