QUIZ-3

1. What is Ann's relation with her husband's mother's only daughter-in-law's sister's husband?

Sol: brother-in-law

Hint: Let Ann be x. x->husband’s mother->mother-in-law if x

Her only daughter-in-law becomes x

X sister’s husband ->brother-in-law.

2. The ratio of Boys to Girls is6:4.60% of the boys and 40% of the girls take lunch in the canteen. What % of class takes lunch in canteen?

Sol: 52%

Hint: Assume there are 6x boys and 4x girls.

Total students taking lunch in canteen=6x(60/100)+4x(40/100)

=36(x/10) + 16(x/10)=52(x/10)

Total students are =6x+4x=10x

% of class taking lunch in canteen= ((52/10)*100)/10x=52%

3. Consider a number 235, where last digit is the sum of first

two digits. How many such 3-digit numbers are there?

Sol:45

Hint: The last digit cannot be 0.If the last digit is 1,there is only one number If the digit is 2,there are 2 numbers in this. 1+2+3+4+5+6+7+8+9=45.

4. Product of three consecutives numbers is 210.What is the sum of two least numbers?

Sol: 11

Hint: 5,6,7;5+6=11;

5. A student divided a number by 2/3 when he required to multiply by 3/2.Calculate the percentage of error in his result?

Sol: 0%

Hint: divided by 2/3 and multiply by 3/2 is same.Therefore percentage of error is 0%.