Question
There are some Crows and Cows in a field. If the total
number of heads in the field is 480 and the total number of legs is 1320, what is the number of crows in the field?Solution
Number of crows = 5/8× 480 = 300 Alternate shortcut method: Number of cows = (4×number of legs – number of feet)/2 = (4×480 – 1320 )/2 = (1920 – 1320 )/2 = 600/2 =300 Note: if number of cows is asked, then use this shortcut, Number of crows = (number of legs –2×number of feet)/2Â
Pepperonil, ethyl acetate, butyraldehyde and nitrate are some common adulterants used in ____________
Which of the following is acidic in nature?
Which drug is used to cure Hypertension?
Which of the following dyes is used for colouring Paper and typewriters?
Which of the following is used in alcoholic drinks?
Ultra-purification of metals is achieved using:
What is the chemical formula of the mineral malachite?
Which of the following metals is the lightest in the periodic table of elements?
Which device converts sound waves to electrical signals?
Which element is known as the 'King of Chemicals.