Question

20. A primary school is provided with Mid - day meal for 80 students to
last for 60 days. If 20 additional students join, after 15 days, the
number of days the Mid-day meal will last is :
A) 51
B) 50
C) 52
D) 55
Ans. A) 51​

Answer 1

Step-by-step explanation:

no. of students,s and no. of days food lasts,d for them are inversely proportional

s1*d1=s2*d2

after 15 days => deduct 15 from d1, d2

d1=60-15=45, s1 = 80

s2= 80+20=100, d2=(d -15)

80×45= 100×(d-15)

d-15 = 80 × 45 /100 = 36

d= 15+36=51

no. of days meals last = 51