Fun Equations of Mathematics for Teens with Answer

Most of the kids love Astronomy. These Fun Equations of Mathematics have dedicated Astronomy. In this Mathematical Puzzle Question, there are fun equations. In these fun equations, variables are replaced with astronomical objects. Can you find the values of these objects and then solve the last equation to calculate the number which will replace the question mark?

Can you solve this Fun Equations of Mathematics?

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The Answer is 890 
Let me use the following notations for the figures 
S........ Star 
M........Moon 
R......Rocket 
Given: S+R+M = 60.....
(1) R+M = 50.........
(2) M-S = 20........
(3) substituting value of R+M from (2) to (1) S+50= 60, 
S=10 Substituting value of S in (3) M= 30. Substituting value of M in (2) R=30 Therefore, R x R -S= 30x30- 10= 900-10=890

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