30 cards numbered from 11 to 40 were placed on a table. 3 students Ayush, Juthika and Ahona of class 7 were asked to find out the cards numbered with 1 or 0 in the unit’s digit. When asked, Ayush, Juthika and Ahona answered 4, 6 and 5 respectively. [1+1+2=4]
(i) Who answered correctly?
(ii) What were the numbers on those (correctly answered) cards?
(iii) What percentage of the total cards are these
(correctly answered) cards?
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Answer:
30 cards numbered from 11 to 40 were placed on a table. 3 students Ayush, Juthika and Ahona of class 7 were asked to find out the cards numbered with 1 or 0 in the unit's digit. When asked, Ayush, Juthika and Ahona answered 4,6 and 5 respectively.
To do:
We have to answer the given questions.
Solution:
Total number of cards
Cards that have 0 in their units place are 20, 30 and 40.
Cards that have 1 in their units place are 11, 21 and 31.
Number of cards that have 0 or 1 in their units place .
Juthika answered it correctly.
Required percentage of the total cards
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