Froggy Jump; Level 3

Oh, great...Freddy the Frog has done it again. He is stuck on the sinking lilly pads and need to be rescued once more. This time he has wondered into lilly pads that have challenging addition and subtraction problems writen on the lilly pads. Beware, incorrect answers will make Freddy sink along with not solving it in the given time. With only ten seconds to spare to solve, can you save him for the last and final time before sinking?