0

Guest

Courses New

A rectangular water tank is open at the top. Its capacity is 24m3. Its length and breadth are 4m and 3m respectively. Ignoring the thickness of the material used for the building the tank, the total cost of painting the inner and outer surfaces of the tank at Rs. 10 per m2 ,is A. Rs. 400 B. Rs. 500 C. Rs. 600 D. Rs. 800

A rectangular water tank is open at the top. Its capacity is 24m3. Its length and breadth are 4m and 3m respectively. Ignoring the thickness of the material used for the building the tank, the total cost of painting the inner and outer surfaces of the tank at Rs. 10 per m2 ,is
A. Rs. 400
B. Rs. 500
C. Rs. 600
D. Rs. 800

Grade:12th pass

2 Answers

Pawan Prajapati
askIITians Faculty 60787 Points
2 years ago
Our expert is working on this Class X Maths answer. We will update the answer very soon.
Partha
15 Points
one year ago
L=4m,b=3m,let h =xm
Capacity of tank is 24 m^3
i.e volume=l*b*h=24
=>4*3*x= 24
=>12x=24
X=2m=h.
Since the tank is open & thickness of material is to be ignored.
So we have sum of inner & outer surface 
=2(2lh+2bh+lb)
=2(2*4*2+2*3*2+4*3)
=2(16+12+12)
=80 m^3.
Cost of painting per m^2=rs10
Total cost = 80*10= 800.ans is D-800.
 
 

Think You Can Provide A Better Answer ?

Other Related Questions on 10 grade maths

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More