Question

d. Ajar contains 3 white, 4 blue, 5 red and 2 green marbles. If a marble is drawn at random from the
jar, what is the probability that the marble is:
(i) white
(ii) red
(iii) blue
(iv) green
(v) not white
e. The length and breadth of a playground are 80 m and 35 m respectively.
(i) Find the cost of leveling at RS 4.50 per square metre.
(ii) How long will a boy take to go three times round the field, if he walks at rate of 1.5 m
per second ?​

Answer 1

Answer:

hello mate!

Step-by-step explanation:

a)

Ajar, Contains 3 white, 4 blue, 5 red and 2 green Marbles.

Probability = Required/ Total

a.) White= 3/ (3+4+5+2)= 3/14.

b.)Red = 5/14.

c.)blue=4/14.

d.)green= 2/14= 1/7.

E.) Not white= Green, Blue, Red = 4+5+2= 11/14.

b.)(i)The cost of Leveling, Per m²= ₹4.50

Then, The area of The Playground = Length × Breadth

=80m × 35m = 2800m²,

Hence, for 1 m²= ₹4.50

(2800×1)m²= ₹(4.50×2800)

as, R.H.S= L.H.S

2800m²= ₹12,600

(ii)The Perimeter of The play Ground= 2(Length + Breadth) Units,

2(80 + 35)= 2(115) = 230m units.

so, He Covers a distance of 230 M

For 3 times, To cover,

1.5 m = 1 second.

then how many second for, 1 M.

1 m = 1/1.5 second.

so, To cover 3 timesThe field. it will take.

230 m = (230m ×3) × 1/1.5 seconds.

690 m has to be covered

so, 1 m = 1/1.5 seconds.

then,

690 m = 690 × 1/1.5 seconds.

690 m= 460 seconds.

(Note:- I found The answer, as In Grade 7th, science you might have read That, Speed = Distance / Time, Time = Distance / speed).

Thank you mate!

Have a great day ahead!