9 everyday math

Question: Answer: ..

Question: How many words of different 4 letters can be formed out of 7 capital letters, 3 vowels and 8 consonants, if each word starts with a capital letter and contains at least one vowel? Answer: Any capital letter can be chosen as the first letter of each word. So there are 7 ways of..

How many numbers are there between 100 and 1000 such that every digit is either 2 or 9..

Solve the system of linear equations. x +2y + 3z = 6 2x + 4y + z = 7 3x + 2y + 9z = 14 using Cramer's rul..

Each one of the following series form an A.P. i) 1, 3, 5, 7, ii) 3, 7, 11, 15, iii) 15, 12, 9, iv) x, x - d, x - 2d, ..... The common difference is found by subtracting any term of the series from the immediate succeeding term. In the above example, common difference in the first is..

Andy has bought 27 gallons of milk for his coffee shop. He uses 9 2 gallons of milk everyday for few days. How many days can he use the milk? => 6 or 117 or 27 or 12..

Nine less than twice a number is thirteen. Find the number. => 22 or 2 or 13 or 11..

Find nine hundred ninety in standard form. => 990 or 9090 or 90090 or 90900..

Identify 'Nine and forty-eight hundredths' in decimal form. => 9.49 or 10.48 or 10.49 or 9.48..