Ratio and proportion
the ratio of boys to girls in 5th year is 2: 5 if there are 140 pupils in total, how many boys and girls are there?
b)if the ratio of boys to girls in 3rd year is 5: 4 , how many girls would there be when there are 120 boys?

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. at the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation s=300-15x , where s is the number of pair of shoes kelly still needs to sell and x is the number of days she has worked that month. what is the meaning of the number 300 in this equation

What is sin 7x/4 ? i need on this urgent trig