In a test, +3 marks are given for every correct answer and -1 mark is given for every incorrect answer. Sona attempted all questions and got 10 answers correct. But her total score was only +20. (a) How many incorrect answers did she give? (b) How many questions were given in the test?

In a test, +3 marks are given for every correct answer and -1 mark is

1.	In a test, +3 marks are given for every correct answer and -1 mark is given for every incorrect answer. Sona attempted all questions and got 10 answers correct. But her total score was only +20. (a) How many incorrect answers did she give? (b) How many questions were given in the test?
Answer» PHOTOSYNTHESIS is the process in which plants make their food in the presence of carbon dioxide and WATER .PLEASE mark me as BRAINLIEST.