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Question
On getting a sum right, Prof. Ed hands out 5 candies to a student, while he hands 2 candies if the answer is incorrect. During a test, if 10 students were able to give a correct answer out of 20 students, then the total number of candies Prof Ed. had to give is?
On getting a sum right, Prof. Ed hands out 5 candies to a student, while he hands 2 candies if the answer is incorrect. During a test, if 10 students were able to give a correct answer out of 20 students, then the total number of candies Prof Ed. had to give is?
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Solution
The correct option is A 70 candies
On getting a sum right, prof Ed. gives 5 candies to a student, while for an incorrect answer, 2 candies are given.
Out of 20 students, 10 gave the correct answer.
⇒ Number of students with incorrect answer are 20−10=10 students.
Now, Total number of candies handed out =10×5+10×5
Using the distributive theorem of multiplication:
10×5+10×2=10×(5+2)=10×7=70
So, the prof had to give out 70 candies in total.
On getting a sum right, prof Ed. gives 5 candies to a student, while for an incorrect answer, 2 candies are given.
Out of 20 students, 10 gave the correct answer.
⇒ Number of students with incorrect answer are 20−10=10 students.
Now, Total number of candies handed out =10×5+10×5
Using the distributive theorem of multiplication:
10×5+10×2=10×(5+2)=10×7=70
So, the prof had to give out 70 candies in total.
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