The ratio of the number of girls to the number of boys in a town is 90 %. If the total number of boys and girls in the town is 190, how many girls are in the town? 

Some equations have been solved on the basis of a particular system. On the same basis, find the correct answer to the equation.
1 × 3 × 5= 531
2 × 7 ×9 =972
4 × 6 × 8=?

In the following questions, correct the equation by interchanging two signs.
9 × 3 + 8 ÷ 4 – 7= 28

What will be the value of 16 +19 × 51 ÷ 153 – 12 changing the symbols given below?
× and ÷

Identify the symbols to be inserted to make the expression correct.
24 Δ 4 Δ 5 Δ 4

In the following question, by using which mathematical operators will the expression become correct?
30 ? 6 ? 4 ? 5 ? 4

If '+' becomes '-' and '×' becomes '÷', find the value of ((175 + 160) × 50) × 10.

If ‘P’ means ‘÷’ and ‘Q’ means ‘+’ and ‘R’ means ‘×’ then Find the value of 16 P 8 Q 9 R 12?