CROSS MULTIPLICATION my friend Sorry accidentally pressed answer instead of space down Cross multiplication is multiplying across the = sign by the denominator and numerator. For example, 10/5=3/x So we multiply across the = sign, giving us that 10x=15 It is much easier to solve from there; divide by 10 on both sides and x=1.5
3/x=4/20 Same principle applies: 60=4x ÷ by 4 (the coefficient of x) x=15
