Sonali decided to do a survey of birds in her garden over an hour. In that time there were two more sparrows than blue tits, of which there were twice as many as robins, of which there were 80% fewer than the number of wagtails observed. If these were the only species of bird present, and there was an average of eight birds of each species, how many blue tits did Sonali count?
8
Sparrow- s Tit- t Robin- r Wagtail- w
s=t+2 r=s/2= 1/2*(t + 2) r=w-80%---> w=1.8*r=1.8*1/2*(t+2) t+s+r+w=4*8=32 ---> ---> t+(t+2)+t/2+1+1.8*1/2*(t+2)=32 ---> ---> t=8, s=10, r=5, w=9 Blue tits counted - 8
A girl was killed on a Sunday morning, but no one knew who did it.
The mother was in her garden picking flowers.
The dad was with the cook.
The cook was surrounded by knives.
The kid was at school. Can you find who did it?
Mohan covered a distance of 360 km between two cities, taking a total of 13 hours 30 minutes. If part of the distance was covered at 50 km per hour speed and the rest at 60 km per hour speed. How many hours did he travel at 60 km per hour?
At a garden shop they're selling Magic Grass, a patch of sod that doubles in size every day. A man goes to buy some and figures that his garden is big enough that if he buys one patch, it will cover his garden in fourteen days, because each day it doubles in size. So he decides to speed up the process, and buys two patches of sod.
How many days will it now take for the Magic Grass to cover his garden?
Six men do a piece of work in 10 days with an effort of 6 hours per day. How many extra men are required for doing the work of double strength in 4 days with an effort of 5 hours per day
