Cost of 135 envelopes is Rs 45. How many envelopes can be purchased for Rs 10 ?

30 envelopes

Step-by-step explanation:

If the Cost of 135 envelopes is Rs 45, then;

135 envelopes = Rs. 45

To get the amount of envelopes Rs. 10 can buy, we can write;

x = Rs. 10

Divide both expressions

135/x = 45/10

45x = 135 * 10

45x = 1350

x = 1350/45

x = 30

Hence Rs. 10 can purchase 30 envelopes

step-by-step explanation:

why? because i noticed a pattern. 60 120. those numbers without the zero, make the 6 times tables leaving your answer to be b since 6 times 4 is 24 and adding a zero making it 240.