Un comerciante hace balance de perdidas y ganancias cada trimestre y en el primer mes obtuvo una ganancia de $1,800 dolares y en el segundo mes una perdida de $600 dolares y en el total del trimestre tuvo una ganancia de $7,000 dolares ¿cuanto gano o perdió en el tercer mes?

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.

Find solution of the linear equation y = 2/3x + 1/3

Hundred and tens tables to make 430 in five different ways