Elena has $77 to spend. She buys basketball match tickets for $20.10 and a watch for $10.39. Elena buys a sweater with the remaining money. How many dollars does Elena spend on buying the sweater.

$10.05

$30.49

$46.51

$66.61

For this problem, you have to add $10.39 and $20.10 together. When you add those two numbers, you get $30.49. After this, you subtract $30.49 from $77, which would yield $46.51. The answer is C. I know it's this value because the problem says that Elena spends her remaining money on the sweater.