How many units of a 100% solution must be mixed with 18 units of 30% to get 50% mixture?

Let x = Number of units of Solution 1

1x + 18 x 0.3 = 0.5(x + 18)

1x + 5.4 = 0.5x + 9

100x + 5.4 - 0.5x = 0.5x + 9 - 0.5x

0.5x + 5.4 - 5.4 = 9 - 5.4

0.5x = 3.6

x | |

0.5 |

= |

3.6 |

0.5 |

x =