Question

A girl had 400 stamps total collection . 1/10 is Indian stamps. Of the remaining,1/3 were Europe stamps and 100 stamps were Africa .Rest were of USA .how much USA stamp girl have. Solve in full method

Answer 1

1/10 of 400 = 400/10 * 1 = 40 
total stamps left = 400-40 = 360
1/3 of 360= 120
total stamps left = 360 - 120 + 240
100 was african 
total stamps left = 240 - 100 = 140
total number of usa stamps = 140