Figure 3 Q.4 Determine the largest allowable square cross section of a steel shaft of length 6 m if the maximum
shearing stress is not to exceed 120 MPa when the shaft is twisted through one complete revolution. Use
G=77.2GPA.

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.

b segment jm is correct i think