Averages Quiz 1

Answer: Option C

Explanation:

Let the initial number of members in the group be n.

June+July+August=3*31=93.......(1)
July+august+Sept=3*30=90........(2)
June=30

Hence, putting june =30 in equ 1

July+August=63

putting in 2nd equ.
63+Sept=90

hence, Sept=27

Add all the 6 numbers. Then subtract (2068916*4) from their
sum. Then divide that value by 2. Thats the answer.

class strength =x, number of toffees=t
t/8=5(7t/8)/(x-1)
1/8=35/(8(x-1))
x-1 =35

x=36

102^x - 98^x)

to calculate first digit we only need firs digit of no.
to check power
if x=1
then |2^1-8^1|=6
if x=2
then |2^2-8^2|=|4-64|=4-4=0(only take first digit)
if x=3
then |2^3-8^3|= |8-2 |= 6 (only take first digit)
if x=4
then 2^4-8^4= 6-6=0
after x=4 it is repeat

x = 4 ans

Answer: Option B

Explanation:

A.M. of 75 numbers = 35

L+M+N = 48*3......... (1)

L+M+N+O = 44*4 ........ (2)

First Calculate Age of O i.e. 32.

P age is 3 more than O so P = 35

M+N+O+P = 43*4........(3)

From (2) and (3)

L - P = 4

so L = 4+35 = 39

Let there be x pupils in the class.
Total increase in marks = (x * 1/2) = x/2.
x/2 = (83 - 63) => x/2 = 20 => x = 40.

Video solution:

otal weight of boys in the class = 25 *48 = 1200 kgs

Total weight of all students in the class = 45 * 40 = 1800 kgs

Total weight of the girls in the class = 1800 - 1200 = 600 kgs

Thus 600/15 = 40

Mean weight of 7 boys = 56 kg.

Total weight of 7 boys = (56 × 7) kg = 392 kg.

Total weight of 6 boys = (52 + 57 + 55 + 60 + 59 + 55) kg

= 338 kg.

Weight of the 7th boy = (total weight of 7 boys) - (total weight of 6 boys)

= (392 - 338) kg

= 54 kg.