How Heavy How Light MATH-MAGIC - How Heavy How Light

In the balance scale given in the picture below there are $2$ boxes in one pan and $9$ marbles in other pan. If the weight of each marble is $10g,$ then what will be the weight of one box$?$

• A
  $30 g$
• B
  $90 g$
• ✓
  $45 g$
• D
  $20 g$

Answer: C.

• A
  $7 \ kg\ 490\ g$
• ✓
  $7\ kg\ 390\ g$
• C
  $8\ kg\ 390\ g$
• D
  $8\ kg\ 490\ g$

Answer: B.

• A
  $36 \ kg\ 400\ g$
• B
  $37 \ kg\ 300 \ g$
• C
  $36 \ kg\ 300\ g$
• ✓
  $37\ kg\ 400 \ g$

Answer: D.

• A
  $150 \ kg$
• ✓
  $155 \ kg$
• C
  $165 \ kg$
• D
  $160 \ kg$

Answer: B.

• A
  $mg$
• B
  $g$
• ✓
  $kg$
• D
  $ton$

Answer: C.