KINGCASH
17 mai 2021

#1**+2 **

Tom baked some cupcakes. If he gave each of his friends 5 cupcakes, he would have 25 cupcakes left. If he gave each of his friends 9 cupcakes, he would need to bake another 35 more cupcakes. How many cupcakes did Tom bake?

no. of friends = f, guess the no. of cupcakes

What do you know?

Fixed no. of cupcakes (at first) and friends

no. of friends | 5 | 10 | 15 |

5 * f + 25 | 5 * 5 + 25 = 50 | 5 * 10 + 25 = 75 | 5 * 15 + 25 = 100 |

9 * f - 35 | 9 * 5 - 35 = 10 | 9 * 10 - 35 = 55 | 9 * 15 - 35 = 100 |

no | no | yes |

15 friends

9 - 5 = 4

25 + 35 = 60

60 / 4 = 15 (no. of freinds).

5 * 15 + 25 = 100

9 * 15 - 35 =100

100 cupcakes

KINGCASH25 avr. 2021