IBPS RRB OS-1 Paid Test 10

Average number of coolers sold by stores K and P together in both May and June = 395

Total number of coolers sold by stores K and P together in both the months = 395 × 2 = 790

Total number of coolers sold by store K in May and June together = 140 + 190 = 330

Therefore, total number of coolers sold by store P in May and June together = 790 - 330 = 460

Ratio of the number of coolers sold by store P in May to that in June = 13:7

Hence, number of coolers sold by store P in June

= (7/20) × 460 = 161

Total number of coolers sold by Stores M and N together in June = 280 + 240 = 520

Total number of coolers sold by stores J and K together in May = 180 + 140 = 320

Hence, required ratio = 520:320 = 13:8

Total number of coolers sold by store N in May

= 290

Let the number of Dessert coolers sold by store N in May be 3t

Then, number of Tower coolers sold by store N in May = (2/3) × 3t = 2t

According to the question:

=> 3t + 2t = 290

=> 5t = 290

=> t = 58

Hence, number of Tower coolers sold by store N in May = 2t = 2 × 58 = 116

Total number of coolers sold by all the five stores together in May = 180 + 140 + 230 + 320 + 290

= 1160

Total number of coolers sold by all the five stores together in June = 220 + 190 + 150 + 280 + 240

= 1080

Hence, required difference = 1160 - 1080 = 80

Number of coolers sold by store N in May = 290

Total number of coolers sold by stores J and M together in June = 220 + 280 = 500

Hence, required percent = {(500 - 290)/500} × 100 = 42%

Rate of one unit = Rs 7.2

Number of units consumed = 350

Average electricity bill of each person = 350×7.2

= Rs 2520

Average number of units consumed in Jaipur = 350

Average number of units consumed in Noida = 375

Required ratio = 350: 375 = 14: 15

Average number of units consumed by Mumbai

= 200

Average number of units consumed by Vadodara

= 300

Required percentage = ((300 - 200)×100)/300

= 33.3% less