The number of boys and girls in a class are in the ratio `7: 5`. The number of boys is 8 more than the number of girls. What is the total class strength?

Two numbers are in the ratio 5 : 3 . If they differ by 18, what are the numbers?

Form the pair of linear equations in the following problems,and find their solution graphically.(i)10 students of class X took part in a Mathematics quiz.If the number of girls is 4 more than the number of boys,find the number of boys and girls who took part in the quiz.

There are 7 boys and 3 girls in a class. In how many ways can they be arranged in a row such that no two girls are together?

Sum of the digits of a two-digit number is 9. When we interchange the digits, it is found that the resulting new number is greater than the original number by 27. What is the two-digit number?

I have a total of Rs 300 in coins of denomination Rs 1, Rs 2 and Rs 5, the number of Rs 2 coins is 3 times the numbers of Rs 5 coins. The total number of coins is 160. How many coins of cash denomination are with me?

What is the oxidation number of Cr in Cr_2O_7^(2-) ?

Amina thinks of a number and subtracts frac(5)(2) from it. She multiplies the result by 8. The result now obtained is 3 times the same number she thought of. What is the number?

In how many ways can 5 prizes be awarded to 4 boys if each boy is eligible for any number of prizes?