Abycilcle store sells 4/7 of the mountain bikes in his store. then only 24 bikes are left. how many mountain bikes were there originally

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The length of a rectangle is x times the square root of 100. the width is one-half y more than three-halves x. given that the area of the rectangle is 125 cm2, which equation could represent the rectangle in terms of x and y? a) 5xy − 15x = 125 b) 5xy + 15x = 125 c) 15x2 − 5xy = 125 d) 15x2 + 5xy = 125

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.