Question

50 people consume an average of 110 kg of rice in a week. If 20 more people join this group, how many kilogram of rice will be needed for a week?

Answer 1

50 people    x1                110 kg  yi

50+20 =70      x2                   ?? y2

no of people and no of kgs are in direct proportion

x1/y1 = x2/y2

when we cross multiply the formulae changes to 

x1y2 = x2y1

50 * y2 = 110 *70


y2 = 110 * 70/ 50

y2 = 154

therfore 154 kgs of rice is needed for 70 people for a week

Answer 2

Answer:

154 kg

Step-by-step explanation:

No. of people = 50

Weight of rice 50 people consume = 110 kg

Weight of rice 1 person consumes = 110/50

                                                           =2.2

No. of people added  = 20

Total no. of people = 50 +40

                                 = 70

Weight of rice needed by 70 people = 70 x 2.2

                                                               = 154 kg