Rahul spends 10 percent of his weekly allowance on Monday. On Wednesday he spends 1/3 of the remainder. What percent of his allowance is left at the end of Wednesday?

60%

Step-by-step explanation:

Let X be the total amount of Rahul's allowance.

Amount remaining after Monday's expenses can be calculated as:

We then subtract 1/3 from this remaining amount to determine his final balance:

Hence, Rahul has 60% left after end of Wednesday.

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have