Question

_ +_=17
+ +
__. _=21
16 11

Answer 1

Answer:

10+7=17

++

10.5+10.5=21

Answer 2

Answer:

11,5,6,4.2

Step-by-step explanation:

let the variables be a,b,c,d

a+b=17 equation 1

a+c=16 equation 2

b+c=11 equation 3

c×d=21 equation 4

eq1-eq3:(a+b)-(b+c)=17-11

a-c=6 equation 5

now equation 2+equation 5

a+c+a-c=22

2a=22 a=11

substitute the value of a in equation 1 and 2

11+b=17 b=6 (substituting value of a in equation 1)

11+c=16 c=5 (substituting the value of a in equation 2)

substitute the value of c in equation 4

5×d=21 (substituting the value of c in equation 4)

d=4.2

so answers are 11,5,6,4.2