Operations with Integers Class 7 Long Question Answer

Operations with Integers Class 7 Long Question Answer

Operations with Integers Class 7 Long Question Answer

Question 1.

In a true-false test containing 50 questions, a student is to be awarded 2 marks for every correct answer and - 2 for every incorrect answer and 0 for not supplying any answer. If Yash secured 94 marks in a test, what are the possibilities of his marking correct or wrong answer ?

Solution:

Since Yash scored 94 marks

So, minimum correct responses

= 94 ÷ (+ 2) = 47

Two possibilities are there :

(1) Correct answer 47, unattempated 3

(2) Correct answer 48, unattempated, wrong answer 1.

Question 2.

A multistorey building has 25 floors above the ground level each of height 5 m. It also has 3 floors in the basement each of height 5 m. A lift in the building moves at a rate of 1 m/s. If a man starts from 50 m above the ground, how long will it take him to reach at 2nd floor of basement, assuming that the lift is going down ?

Solution:

60 sec or 1 min