Question

3 cube having is 18 cm and 4 cm and 30 cm respectively are mentally and made into a new to find the age of the new cubes of form

Answer 1

new cubes of volume =18×18×18+4×4×4+30×30×30
=8 (9×9×9+2×2×2+15×15×15)
=8 (729+8+3375)
=8×4112
=32986cm3