Question

The weight of four boxes of biscuits is 36 ounces. How many ounces can nine boxes weigh?

Answer 1

Nine boxes of biscuits would weight `81` ounces.

Explanation:

Let x be the weight of nine boxes of biscuits in ounces.
`4/36 = 9/x`
By cross-multiplication:
`4x = 36*9`
`4x = 324`
`x = 324/4`
`x = 81`