solve this question 20 ,21
Answers
tera paper a raha ha or tu abhi bhi ncert kar raha ha bhai kuc or kar le kuc bann jayga
Answer:
Step-by-step explanation:
(20) ans=area of rectangle is 63x5 or 315 cm^2
Let the two parallel sides by 16x and 5x.
area of trap = (average of 2 parallel sides)(height)
= ((16x + 5x)/2)(5) = (4/15)(315)
105x/2 = 84
105x = 168
x = 8/5 = 1.6
The two sides are 25.6 and 8
check:
area = (25.6+8)/2(5) = 84
and (4/15)(315) = 84
(21) ans= area of rectangular field=4356m^2
length of field = 99m
breadth = area/length=4356/99=44m
width of the road=4.5m
area of the road parallel to the length=99*4.5=445.5m^2
area of the road parallel to the breadth=44*4.5=198m^2
and area of the common square portion=4.5*4.5=20.25m^2
total area of the road= 445.5+198-20.25=623.25sq.m
area of each square stone=1.5*1.5 sq.m
required number of stone for road =623.25/1.5*1.5 =277