Please help me to answer these questions!!
1- There are 40 ping-pong balls in a box. 16 of them are dented. Find the ratio of the number is dented ping-pong balls to the total number of ping-pong balls in the box if another 12 dented ping-pong balls are added into the box??
=
2- The total height of three friends, Sasha, Tess and Wendy, is 470 cm. The ratio of the height of Sasha to the height of Tess is 3 : 4. Wendy is 30 cm taller than Tess. Find the ratio of Tess’ height to Wendy’s height??
=
3- Josh, Ben and Rick have 70 marbles altogether. The ratio of the number is marbles Josh has to the number of marbles Rick has is 1 : 2. However, Ben has 15 marbles fewer than Rick. How many marbles does Ben have?
=
